💬 NRF52 Recessed Vibration+Contact sensor for door/window
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Why did you use LIS3DH ? ADXL362 seems to be better. You can have 100 mesures / second with 2uA consumption according to this : https://ez.analog.com/docs/DOC-15838
@Fabien said in 💬 NRF52 Recessed Vibration+Contact sensor for door/window:
Why did you use LIS3DH ? ADXL362 seems to be better. You can have 100 mesures / second with 2uA consumption according to this : https://ez.analog.com/docs/DOC-15838
I asked myself the same question, then I checked the prices and if you want it in small quantities from a reputable source, LIS3DH is 1/4 of the price (1.5$ compared to 6$) while keeping a "low enough" power consumption.
ADXL362 is much cheaper on AliExpress but when best price seen on octopart is over 3$ from a non authorized distributor I'm a bit suspicious when seeing prices just over 2$... -
i remember of this one ;)
i did this because:- i have lis3dh in stock and wanted to validate my idea.
- cost. LIS3DH is one of the cheapest and low power accelerometer
- fabhouse usually source at known suppliers in case of pcba, and the adxl is not very cheap.
- I2C because it was really very tight to route the pcb regarding the very small size, and without signals vias on bottom touching gnd coincell (and i'm not fan of tabbed coincell.. ) . SPI would have needed more pins to route
- it is mainly for detecting tilts on door intrusion or knocks. I didn't need a very precise accelerometer for motion.
- I wanted to make a very cheap but reliable door sensor. I think goal is achieved :)
Too much work actually, plus received some new launchpads to evaluate, i also need to assemble some of my new boards for the faire etc., so, i'm not sure yet when, but i'll take a look whether the adxl would fit, in case you really need it ;)
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i remember of this one ;)
i did this because:- i have lis3dh in stock and wanted to validate my idea.
- cost. LIS3DH is one of the cheapest and low power accelerometer
- fabhouse usually source at known suppliers in case of pcba, and the adxl is not very cheap.
- I2C because it was really very tight to route the pcb regarding the very small size, and without signals vias on bottom touching gnd coincell (and i'm not fan of tabbed coincell.. ) . SPI would have needed more pins to route
- it is mainly for detecting tilts on door intrusion or knocks. I didn't need a very precise accelerometer for motion.
- I wanted to make a very cheap but reliable door sensor. I think goal is achieved :)
Too much work actually, plus received some new launchpads to evaluate, i also need to assemble some of my new boards for the faire etc., so, i'm not sure yet when, but i'll take a look whether the adxl would fit, in case you really need it ;)
@scalz is there any chance that one could buy this device preassembled from you?
I was thinking I could use something really tiny as a one button scene controller and found your design.
Maybe you can even leave out some components in my case to keep the effort and cost down?
Or do you have some other design that would fit my purpose (small one-button scene controller)?- Tomas
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@scalz is there any chance that one could buy this device preassembled from you?
I was thinking I could use something really tiny as a one button scene controller and found your design.
Maybe you can even leave out some components in my case to keep the effort and cost down?
Or do you have some other design that would fit my purpose (small one-button scene controller)?@korttoma said in 💬 NRF52 Recessed Vibration+Contact sensor for door/window:
Or do you have some other design that would fit my purpose (small one-button scene controller)?
Hello Tomas, I have bought one of those. They are over 20mm diameter so not as small as the one from @scalz but still pretty small and they have a physical button + a led (and an unpopulated footprint for an accelerometer, too).
This is the one I bought but there are many seller, I hope with a better price as when I bought it, I paid less than 4€ and shipping included. I have received mine but not tested programming it yet, if you want me to confirm there's no problem to reprogram it I'll can check it during the week.
https://www.aliexpress.com/item/2V-3-3V-NRF51822-Bluetooth-4-0-Wireless-Module-For-iBeacon-Base-Station-Intelligent-Control-System/32824004498.html -
@korttoma said in 💬 NRF52 Recessed Vibration+Contact sensor for door/window:
Or do you have some other design that would fit my purpose (small one-button scene controller)?
Hello Tomas, I have bought one of those. They are over 20mm diameter so not as small as the one from @scalz but still pretty small and they have a physical button + a led (and an unpopulated footprint for an accelerometer, too).
This is the one I bought but there are many seller, I hope with a better price as when I bought it, I paid less than 4€ and shipping included. I have received mine but not tested programming it yet, if you want me to confirm there's no problem to reprogram it I'll can check it during the week.
https://www.aliexpress.com/item/2V-3-3V-NRF51822-Bluetooth-4-0-Wireless-Module-For-iBeacon-Base-Station-Intelligent-Control-System/32824004498.html -
@korttoma said in 💬 NRF52 Recessed Vibration+Contact sensor for door/window:
Or do you have some other design that would fit my purpose (small one-button scene controller)?
Hello Tomas, I have bought one of those. They are over 20mm diameter so not as small as the one from @scalz but still pretty small and they have a physical button + a led (and an unpopulated footprint for an accelerometer, too).
This is the one I bought but there are many seller, I hope with a better price as when I bought it, I paid less than 4€ and shipping included. I have received mine but not tested programming it yet, if you want me to confirm there's no problem to reprogram it I'll can check it during the week.
https://www.aliexpress.com/item/2V-3-3V-NRF51822-Bluetooth-4-0-Wireless-Module-For-iBeacon-Base-Station-Intelligent-Control-System/32824004498.html@Nca78 said in 💬 NRF52 Recessed Vibration+Contact sensor for door/window:
(and an unpopulated footprint for an accelerometer, too).
I wonder whether that unpopulated footprint is where the antenna is?
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@scalz May I request you to share your code for it please. Thanks.
