Anyone using/tried the E28-2G4M27S 2.4Ghz LoRa SX1280 27dB module?
-
@NeverDie said in Anyone using/tried the E28-2G4M27S 2.4Ghz LoRa SX1280 27dB module?:
Dupont headers
My plan is to use female headers on the Barebones board, then to use doubled long-legged male headers on the SX1280 adapter board like these from Digikey. It all stacks together and bed of nails will stick out the top of it all. That way the PPK2 Dupont females can nicely plug onto the any of the protruding males in the stack that I select to use as a signal or interrupt. Again, I risk a bed of 16 inadvertent antennae with all that metal in the air. I can always snip-off the pins I don’t use. PPK2 is expected on Monday!
I spent the day shopping for parts at Aliexpress, Digikey, and Amazon. I found some 328P's at Aliexpress. Could be some time for the Aliexpress parts (SX1280 module). In the meantime I'll be learning KiCAD. I'm hoping that Eagle and KiCAD might allow file swapping as Eagle is familiar ground for me. Or ... I could just take the easy path and go directly to OSHPark since you have made it so easy.
@Larson KiCAD 6 allows for importing Eagle projects right from within KiCAD 6 itself. Not sure what options, if any, might exist for exporting to Eagle. I think you'll like KiCAD 6. It's pretty easy to pick it up--much easier than earlier versions. I previously used Diptrace, because it was so easy, but I've since moved completely over to KiCAD 6 because it's just as easy, but also more widely supported in terms of parts libraries. Also, unlike Diptrace, it makes sharing projects a snap--just create an archive (literally a one menu click operation), and share the resulting zip file.
-
@Larson said in Anyone using/tried the E28-2G4M27S 2.4Ghz LoRa SX1280 27dB module?:
@NeverDie said in Anyone using/tried the E28-2G4M27S 2.4Ghz LoRa SX1280 27dB module?:
Dupont headers
My plan is to use female headers on the Barebones board, then to use doubled long-legged male headers on the SX1280 adapter board like these from Digikey. It all stacks together and bed of nails will stick out the top of it all. That way the PPK2 Dupont females can nicely plug onto the any of the protruding males in the stack that I select to use as a signal or interrupt. Again, I risk a bed of 16 inadvertent antennae with all that metal in the air. I can always snip-off the pins I don’t use. PPK2 is expected on Monday!
Somehow I had gotten it in my head to use extra long female headers (such as these, https://www.amazon.com/gp/product/B071GTP5V6/ref=ppx_od_dt_b_asin_title_s00?ie=UTF8&psc=1, or similar) on the adapter board and then regular female headers on the basic atmega328p PCB. Maybe it's a wash?
@NeverDie said in Anyone using/tried the E28-2G4M27S 2.4Ghz LoRa SX1280 27dB module?:
Somehow I had gotten it in my head...
So many ways to cook an egg. The pleasure is in eating it. I'll take a picture of my wedding-cake-of-a-board stack when I finish. It may not be until July at my pace.
Re KiCAD: I look forward to trying. Recently JLCPCB made me learn EasyEDA and it really went well. Learning Eagle took me a week the first time, 2 days the second time, and still... I have to retrain. That is the joy of it all, right?
-
By the way, I've recently been reporting some other progress on the SX1280 on my radio-comparison thread: https://forum.mysensors.org/topic/11954/most-reliable-best-radio/27?_=1654402718278 For things that are both battery operated and subject to remote control, the importance of being able to quickly wake them up at a moments notice, but with minimal ongoing energy drain, is an important topic. Examples: key finder fobs, remotely opening/closing blinds at the push of a button, etc.
-
By the way, I've recently been reporting some other progress on the SX1280 on my radio-comparison thread: https://forum.mysensors.org/topic/11954/most-reliable-best-radio/27?_=1654402718278 For things that are both battery operated and subject to remote control, the importance of being able to quickly wake them up at a moments notice, but with minimal ongoing energy drain, is an important topic. Examples: key finder fobs, remotely opening/closing blinds at the push of a button, etc.
-
From the perspective of having some kind of general purpose platform--not just for testing but as a "go-to" for general use--it would be nice to have some kind of project box or enclosure of some kind for it. That would prevent things in the environment from pushing up against the electronics/PCB and possibly shorting it out. Anyone have any ideas on what form that should take? There's always the option of custom 3D printing something, but if there were a box of the right size already out there, that would be much easier. In that case one could customize the PCB to fit it precisely instead of 3D printing a box to precisely fit the PCB. Having a nice enclosure is one of the things that typically separates store-bought sensors from hobbyist projects.
By the way, the SHT45 TH sensor that I mentioned in the OP is now available on mouser. Unfortunately, it seems they nearly doubled their asking price over what they had earlier projected, so that's a bit of a disappointment. I guess these days a lot of chips are marked up due to the widespread shortages going on.... The chip itself is quite small, but it only has four landing pads, so I'm thinking that hand soldering it should be manageable. A simple adapter board, like this one for the SHT40, would allow it to easily fit the platform:
because the platform's pinout already anticipates adding up to two I2C devices without any fuss, like thus:
FYI, I updated the project page with a bunch of photos. -
From the perspective of having some kind of general purpose platform--not just for testing but as a "go-to" for general use--it would be nice to have some kind of project box or enclosure of some kind for it. That would prevent things in the environment from pushing up against the electronics/PCB and possibly shorting it out. Anyone have any ideas on what form that should take? There's always the option of custom 3D printing something, but if there were a box of the right size already out there, that would be much easier. In that case one could customize the PCB to fit it precisely instead of 3D printing a box to precisely fit the PCB. Having a nice enclosure is one of the things that typically separates store-bought sensors from hobbyist projects.
By the way, the SHT45 TH sensor that I mentioned in the OP is now available on mouser. Unfortunately, it seems they nearly doubled their asking price over what they had earlier projected, so that's a bit of a disappointment. I guess these days a lot of chips are marked up due to the widespread shortages going on.... The chip itself is quite small, but it only has four landing pads, so I'm thinking that hand soldering it should be manageable. A simple adapter board, like this one for the SHT40, would allow it to easily fit the platform:
because the platform's pinout already anticipates adding up to two I2C devices without any fuss, like thus:
FYI, I updated the project page with a bunch of photos.@NeverDie said in Anyone using/tried the E28-2G4M27S 2.4Ghz LoRa SX1280 27dB module?:
Anyone have any ideas on what form that should take?
Looks great! I’ve had good luck at Aliexpress with a variety of boxes like these. Some boxes have mounting lugs on the bottom. Your board has no space for mounting holes. I could help with the redesign??? Then I'd use stand-offs to get to the lugs and suspend the batteries in the air off the bottom. The antenna could be curled inside the box, but I've found that to have a negative impact (probably the polairity thing.
[Edit: Forgot to say that I've thrown in the little bags of desiccants for good measure. I find them in my pill bottles.]
-
From the perspective of having some kind of general purpose platform--not just for testing but as a "go-to" for general use--it would be nice to have some kind of project box or enclosure of some kind for it. That would prevent things in the environment from pushing up against the electronics/PCB and possibly shorting it out. Anyone have any ideas on what form that should take? There's always the option of custom 3D printing something, but if there were a box of the right size already out there, that would be much easier. In that case one could customize the PCB to fit it precisely instead of 3D printing a box to precisely fit the PCB. Having a nice enclosure is one of the things that typically separates store-bought sensors from hobbyist projects.
By the way, the SHT45 TH sensor that I mentioned in the OP is now available on mouser. Unfortunately, it seems they nearly doubled their asking price over what they had earlier projected, so that's a bit of a disappointment. I guess these days a lot of chips are marked up due to the widespread shortages going on.... The chip itself is quite small, but it only has four landing pads, so I'm thinking that hand soldering it should be manageable. A simple adapter board, like this one for the SHT40, would allow it to easily fit the platform:
because the platform's pinout already anticipates adding up to two I2C devices without any fuss, like thus:
FYI, I updated the project page with a bunch of photos.@NeverDie I've made progress. I've ordered these items (mostly radios):
SX1278
SX1280
nrf24012mg E01's
nrf2401+
Bunch of antenna parts
TPL5110
Atmega328's
I cannot find any SX1262's and after your other post ("Best") I see that this is the darling to have. Any idea of where to find some?Fun to see the photos of the current meter in sleep action on your other post.
One addition I would like to make to your boards is a GPS chip. The idea would be to walk about in a field and collect RSSI and SNR data. Combining these elements would give a pretty good picture of signal vs the 2-dimensions of GPS data - for each radio and different modulations, spreading factors... Trouble here is that there are too many parameters to play with. I see Excel graphics coming into play. I have no experience with GPS, although I own a few of the chips.
-
The ones I've tried so far are these: https://www.ebay.com/itm/202574135410?hash=item2f2a5c0072:g:H9EAAOSwLuldcige Maybe it was luck, but the seller delivered fairly quickly, and they were very well packed. They allegedly contain TCXO's, so that presumably makes them better than those moules which don't have TCXO's.
I just today received these Ra-01SH, but haven't tried them yet: https://www.aliexpress.com/item/2255800961841511.html?spm=a2g0o.order_list.0.0.20411802pmZPEx&gatewayAdapt=4itemAdapt
I have custom adapter boards for them though. At the time I ordered them in April they were just $3.31 each, but now the same seller is asking $4.24. Delivery time was pretty long (longer than originally promised). So, you may want to shop around. If this is the new market rate, then I would go for the Dorji boards instead, because for the money you at least get TCXO's with the Dorji's, and they allegedly passed FCC. On the other hand, I've had good luck with Ai-Thinker in the past.There are some other brands out there as well, but these are the only two for which I made adapter boards.
-
@NeverDie I've made progress. I've ordered these items (mostly radios):
SX1278
SX1280
nrf24012mg E01's
nrf2401+
Bunch of antenna parts
TPL5110
Atmega328's
I cannot find any SX1262's and after your other post ("Best") I see that this is the darling to have. Any idea of where to find some?Fun to see the photos of the current meter in sleep action on your other post.
One addition I would like to make to your boards is a GPS chip. The idea would be to walk about in a field and collect RSSI and SNR data. Combining these elements would give a pretty good picture of signal vs the 2-dimensions of GPS data - for each radio and different modulations, spreading factors... Trouble here is that there are too many parameters to play with. I see Excel graphics coming into play. I have no experience with GPS, although I own a few of the chips.
@Larson I don't know how well GPS location works indoors, but it if somehow does that would be interesting. If it has gotten small enough and cheap enough and low power enough, it would be interesting for clock synchronization as well, though there are other ways of doing that.
-
Wow, I just checked, and GPS receivers have really gotten small, especially as compared to 5 years ago. Just 7mmx7mm in size: https://www.mouser.com/ProductDetail/Quectel/LG77LIAMD?qs=zW32dvEIR3sKRLNP92tehQ%3D%3D
That's way smaller than the old Adafruit one that I have: https://www.adafruit.com/product/5440
which is gigantic. -
The ones I've tried so far are these: https://www.ebay.com/itm/202574135410?hash=item2f2a5c0072:g:H9EAAOSwLuldcige Maybe it was luck, but the seller delivered fairly quickly, and they were very well packed. They allegedly contain TCXO's, so that presumably makes them better than those moules which don't have TCXO's.
I just today received these Ra-01SH, but haven't tried them yet: https://www.aliexpress.com/item/2255800961841511.html?spm=a2g0o.order_list.0.0.20411802pmZPEx&gatewayAdapt=4itemAdapt
I have custom adapter boards for them though. At the time I ordered them in April they were just $3.31 each, but now the same seller is asking $4.24. Delivery time was pretty long (longer than originally promised). So, you may want to shop around. If this is the new market rate, then I would go for the Dorji boards instead, because for the money you at least get TCXO's with the Dorji's, and they allegedly passed FCC. On the other hand, I've had good luck with Ai-Thinker in the past.There are some other brands out there as well, but these are the only two for which I made adapter boards.
@NeverDie Thanks, once again. Done and purchased (4 1262's, and 2 1276's (ra-01SH)). I don't know why google and I couldn't find the1262's, nor Digikey, nor Ali, nor Amazon. So I'm on the slow road. I don't expect you to wait for me but your records in this forum are a standing education for all that follow. I'm sure I'll have observations/questions if you are still there.
Per my GPS thinking: I was thinking outdoors in an open field. I know your objective was through a reinforced footing, across the house, and up a floor. For that environment I would map the house into a grid with surveyor's cord and walk a defined pattern, clicking a button for every grid point I cross. Then I'd go to the yard with the same idea. My wife tells me I'm hard to live with... imagine that.
-
@NeverDie Thanks, once again. Done and purchased (4 1262's, and 2 1276's (ra-01SH)). I don't know why google and I couldn't find the1262's, nor Digikey, nor Ali, nor Amazon. So I'm on the slow road. I don't expect you to wait for me but your records in this forum are a standing education for all that follow. I'm sure I'll have observations/questions if you are still there.
Per my GPS thinking: I was thinking outdoors in an open field. I know your objective was through a reinforced footing, across the house, and up a floor. For that environment I would map the house into a grid with surveyor's cord and walk a defined pattern, clicking a button for every grid point I cross. Then I'd go to the yard with the same idea. My wife tells me I'm hard to live with... imagine that.
@Larson According to AI-thinker, the Ra-01SH is an SX1262, not a 1276. The SX1262's are more capable, whereas the 1276's are older generation. https://docs.ai-thinker.com/_media/lora/docs/ra-01sh_specification.pdf AFAIK, the two adafruit modules I got for trial purposes were SX1276's.
Since you'll be trying more than just the Ebyte module, let me know if you'd like me to post the other adapter boards also (e.g. for the Dorji SX1262, the Ra-01SH, and the nRF24L01). The work is already done.
-
Wow, I just checked, and GPS receivers have really gotten small, especially as compared to 5 years ago. Just 7mmx7mm in size: https://www.mouser.com/ProductDetail/Quectel/LG77LIAMD?qs=zW32dvEIR3sKRLNP92tehQ%3D%3D
That's way smaller than the old Adafruit one that I have: https://www.adafruit.com/product/5440
which is gigantic.@NeverDie said in Anyone using/tried the E28-2G4M27S 2.4Ghz LoRa SX1280 27dB module?:
That's way smaller than the old Adafruit one that I have: https://www.adafruit.com/product/5440
which is gigantic.At some point, like this, bigger is better for me. Imagine the size of the GPS in modern phones. I prefer the Adafruit type that has breakout pins and 'hold-my-hand' tutorials. We live in a golden age. I have to go find my GPS boards that i think I have. It has been some time and I've always wanted some purpose. This may be the time.
-
Definitely agree that it's the tutorials that make the adafruit hardware worthwhile, typically much more so than the hardware itself.
-
@Larson According to AI-thinker, the Ra-01SH is an SX1262, not a 1276. The SX1262's are more capable, whereas the 1276's are older generation. https://docs.ai-thinker.com/_media/lora/docs/ra-01sh_specification.pdf AFAIK, the two adafruit modules I got for trial purposes were SX1276's.
Since you'll be trying more than just the Ebyte module, let me know if you'd like me to post the other adapter boards also (e.g. for the Dorji SX1262, the Ra-01SH, and the nRF24L01). The work is already done.
@NeverDie said in Anyone using/tried the E28-2G4M27S 2.4Ghz LoRa SX1280 27dB module?:
let me know if you'd like me to post the other adapter boards
The other adapter boards would be great... but I thought I'd earn my way into it by working with what you have already posted for the SX1280. To date I've been collecting pinouts to study the patterns so I could understand the template(s). What ever you post is a gift and I thank you. I'm sure that others to come will also enjoy. You have built quite a platform and I'm inspired.
-
@Larson According to AI-thinker, the Ra-01SH is an SX1262, not a 1276. The SX1262's are more capable, whereas the 1276's are older generation. https://docs.ai-thinker.com/_media/lora/docs/ra-01sh_specification.pdf AFAIK, the two adafruit modules I got for trial purposes were SX1276's.
Since you'll be trying more than just the Ebyte module, let me know if you'd like me to post the other adapter boards also (e.g. for the Dorji SX1262, the Ra-01SH, and the nRF24L01). The work is already done.
@NeverDie said in Anyone using/tried the E28-2G4M27S 2.4Ghz LoRa SX1280 27dB module?:
According to AI-thinker, the Ra-01SH is an SX1262, not a 1276.
As I'm shoping around I found the Ra-01 Lora, but it was assocaited with the 1276 per this link you offered: https://www.aliexpress.com/item/2255800961841511.html?spm=a2g0o.order_list.0.0.20411802pmZPEx&gatewayAdapt=4itemAdapt&aff_fcid=d9908c021fe34eeeb0ea05b879ca4432-1654498510220-06752-_uYd1nh&aff_fsk=_uYd1nh&aff_platform=api-new-link-generate&sk=_uYd1nh&aff_trace_key=d9908c021fe34eeeb0ea05b879ca4432-1654498510220-06752-_uYd1nh&terminal_id=afb1662bfbca4bd68d5ee03a630ea8c7&afSmartRedirect=y.
Given that I haven't studied the datasheets, I don't exactly know the shape-shifting ability of one chip to act as another. Not sure where to go with this one - but I'll know more when they arrive. I'll work on it in the AM when I'm fresher.
-
@NeverDie said in Anyone using/tried the E28-2G4M27S 2.4Ghz LoRa SX1280 27dB module?:
According to AI-thinker, the Ra-01SH is an SX1262, not a 1276.
As I'm shoping around I found the Ra-01 Lora, but it was assocaited with the 1276 per this link you offered: https://www.aliexpress.com/item/2255800961841511.html?spm=a2g0o.order_list.0.0.20411802pmZPEx&gatewayAdapt=4itemAdapt&aff_fcid=d9908c021fe34eeeb0ea05b879ca4432-1654498510220-06752-_uYd1nh&aff_fsk=_uYd1nh&aff_platform=api-new-link-generate&sk=_uYd1nh&aff_trace_key=d9908c021fe34eeeb0ea05b879ca4432-1654498510220-06752-_uYd1nh&terminal_id=afb1662bfbca4bd68d5ee03a630ea8c7&afSmartRedirect=y.
Given that I haven't studied the datasheets, I don't exactly know the shape-shifting ability of one chip to act as another. Not sure where to go with this one - but I'll know more when they arrive. I'll work on it in the AM when I'm fresher.
-
@Larson When you hover over the different modules on that webpage, it will tell you the name of the model. They're all different.
-
From the perspective of having some kind of general purpose platform--not just for testing but as a "go-to" for general use--it would be nice to have some kind of project box or enclosure of some kind for it. That would prevent things in the environment from pushing up against the electronics/PCB and possibly shorting it out. Anyone have any ideas on what form that should take? There's always the option of custom 3D printing something, but if there were a box of the right size already out there, that would be much easier. In that case one could customize the PCB to fit it precisely instead of 3D printing a box to precisely fit the PCB. Having a nice enclosure is one of the things that typically separates store-bought sensors from hobbyist projects.
By the way, the SHT45 TH sensor that I mentioned in the OP is now available on mouser. Unfortunately, it seems they nearly doubled their asking price over what they had earlier projected, so that's a bit of a disappointment. I guess these days a lot of chips are marked up due to the widespread shortages going on.... The chip itself is quite small, but it only has four landing pads, so I'm thinking that hand soldering it should be manageable. A simple adapter board, like this one for the SHT40, would allow it to easily fit the platform:
because the platform's pinout already anticipates adding up to two I2C devices without any fuss, like thus:
FYI, I updated the project page with a bunch of photos.@NeverDie said in Anyone using/tried the E28-2G4M27S 2.4Ghz LoRa SX1280 27dB module?:
Anyone have any ideas on what form that should take?
Second effort: This link shows a type of box with mounting points on the bottom. It would be nice if there were a PCB footprint for the holes, but I could find none. Using a paper rubbing and a set of calipers one can create their own footprint and build the PCB to that dimension. For any hard wires that must be passed through the box, I've been using cable glands like these for a waterproof enclosure. See the Cave Pearl Project for a different deep-sea approach,
-
I posted the rest of the radio module adapters to openhardware.io.
