nRF5 action!
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@rmtucker
On the supercapacitor subject.
Nick Gammon used a 0.47uf 5.5v capacitor and you have been trying a 10uf 2.7v.
So i was going to try a 4uf 5.5v super cap and an mcp1700-33 to power the nrf at 3.3v.
I was going to charge the supercap initially with an adjustable dc-dc converter set to 5v while experimenting,anyone see a problem?@rmtucker said in nRF5 Bluetooth action!:
@rmtucker
On the supercapacitor subject.
Nick Gammon used a 0.47uf 5.5v capacitor and you have been trying a 10uf 2.7v.
So i was going to try a 4uf 5.5v super cap and an mcp1700-33 to power the nrf at 3.3v.
I was going to charge the supercap initially with an adjustable dc-dc converter set to 5v while experimenting,anyone see a problem?I'm assuming Nick Gammon was using not an Nordic radio but just an atmega chip? I don't think you'll get much runtime on a 0.47uF supercap, nor a 4uF supercap, because of the radio.
On the plus side, it should charge up almost instantly. :)
On the other hand, 100uF should be enough to send at least one packet. I haven't tried that low an amount on the nrf52, but I have done it with a 100uF (charged to 2.7v) powering an atmega328p+RFM69 combo.
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@rmtucker said in nRF5 Bluetooth action!:
@rmtucker
On the supercapacitor subject.
Nick Gammon used a 0.47uf 5.5v capacitor and you have been trying a 10uf 2.7v.
So i was going to try a 4uf 5.5v super cap and an mcp1700-33 to power the nrf at 3.3v.
I was going to charge the supercap initially with an adjustable dc-dc converter set to 5v while experimenting,anyone see a problem?I'm assuming Nick Gammon was using not an Nordic radio but just an atmega chip? I don't think you'll get much runtime on a 0.47uF supercap, nor a 4uF supercap, because of the radio.
On the plus side, it should charge up almost instantly. :)
On the other hand, 100uF should be enough to send at least one packet. I haven't tried that low an amount on the nrf52, but I have done it with a 100uF (charged to 2.7v) powering an atmega328p+RFM69 combo.
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@rmtucker said in nRF5 Bluetooth action!:
mcp1700-33
It appears to be just an LDO. So, you won't get any advantage to charging your capacitor to greater than 3.3v.
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@NeverDie
I think he was using an nrf24 just the same as us.
He was getting 32hours without re-charging and transmitting every 5mins.@rmtucker said in nRF5 Bluetooth action!:
@NeverDie
I think he was using an nrf24 just the same as us.
He was getting 32hours without re-charging and transmitting every 5mins.Really? Wow. That I'd like to see. I don't see how it's even possible. Do you have a link?
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@rmtucker said in nRF5 Bluetooth action!:
@NeverDie
I think he was using an nrf24 just the same as us.
He was getting 32hours without re-charging and transmitting every 5mins.Really? Wow. That I'd like to see. I don't see how it's even possible. Do you have a link?
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@rmtucker
On the supercapacitor subject.
Nick Gammon used a 0.47uf 5.5v capacitor and you have been trying a 10uf 2.7v.
So i was going to try a 4uf 5.5v super cap and an mcp1700-33 to power the nrf at 3.3v.
I was going to charge the supercap initially with an adjustable dc-dc converter set to 5v while experimenting,anyone see a problem?@rmtucker said in nRF5 Bluetooth action!:
Nick Gammon used a 0.47uf 5.5v capacitor
Re-read your link. He used a 0.47F capacitor, not a 0.47uF capacitor. That's a million times difference.
0.47F works. I arrived at 10F because it seems to be a sweet spot in the way that supercaps are priced. You can get a lot of Farads for just $2.
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@rmtucker said in nRF5 Bluetooth action!:
Nick Gammon used a 0.47uf 5.5v capacitor
Re-read your link. He used a 0.47F capacitor, not a 0.47uF capacitor. That's a million times difference.
0.47F works. I arrived at 10F because it seems to be a sweet spot in the way that supercaps are priced. You can get a lot of Farads for just $2.
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@NeverDie
My Mistake but his results were impressive don't you think?
Anyway i was just going to use 4f because i can get one.
How are you charging your Cap?@rmtucker said in nRF5 Bluetooth action!:
How are you charging your Cap?
6v mini solar panel run through diode and a 2.7v ldo. That works for me indoors even 15-20 feet away from a window.
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@rmtucker said in nRF5 Bluetooth action!:
How are you charging your Cap?
6v mini solar panel run through diode and a 2.7v ldo. That works for me indoors even 15-20 feet away from a window.
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@NeverDie
Hmm the only 2.7v ldo i can see are surface mount in the uk.
Thats a no no for me.@rmtucker said in nRF5 Bluetooth action!:
@NeverDie
Hmm the only 2.7v ldo i can see are surface mount in the uk.
Thats a no no for me.Yeah, I'm using surface mount, but I solder it on manually the old fashioned way. Not all surface mount are difficult just because they're SMD. Simply avoid the ones with too small a pitch.
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@rmtucker said in nRF5 Bluetooth action!:
@NeverDie
Hmm the only 2.7v ldo i can see are surface mount in the uk.
Thats a no no for me.Yeah, I'm using surface mount, but I solder it on manually the old fashioned way. Not all surface mount are difficult just because they're SMD. Simply avoid the ones with too small a pitch.
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Where is the sleep(...) function defined for the nrf5? I've looked, but I can't seem to find which library it is in. Anyone know?
@NeverDie said in nRF5 Bluetooth action!:
Where is the sleep(...) function defined for the nrf5? I've looked, but I can't seem to find which library it is in. Anyone know?
It's defined in "hal/architecture/MyHwNRF5.cpp"
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@Toyman said in nRF5 Bluetooth action!:
If anybody need cheap NRF52 DK, Arrow has them for ca. $30 with free courier shipping!
10% discount at the moment so 29.48$. Given the price per unit of a nrf52 if you buy in small numbers, it's worth buying it just for the extra chips provided :D
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Speaking as a noob myself, I think the DK's are great for noobs, especially when first getting started. I don't have as big a need for them now, but they definitely helped in the beginning. They pretty much "just work" without a lot of fuss.
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I'm presently playing around with the radioHead library. I can:
- Send and receive backets between two nRF5 modules.
or - Send and receive packets between two nRF24L01 modules.
However, at present, I can't send or receive packets successfully between an nRF24 and an nRF5 module, even though it appears they share the same network ID, the same datarate, and the same channel.
I'm guessing there exists some kind of compatability mode (?) that would bridge this gap, but I haven't found it. :(
- Send and receive backets between two nRF5 modules.
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@NeverDie
d00616 added the support of NRF5 + ESB to MySensors.
Radiohead lib doesn't handle this mode (explained in the description of his NRF51class).Yeah, MySensors can definitely do it. Nice work @d00616 !
It turns out that with RadioHead, I am almost able to send packets from an nRF24L01 to an nRF5 module: it's just that the packets arrive as garbage. So, the packet and/or frame formatting must be different, but indeed the network ID's are matching or else I wouldn't be receiving anything at all.
