Hi,
I'm here looking for support in designing a physical pressure switch that can transmit a wireless signal to a digital counter. Each time the switch is pressed the counter counts up one.
I've bought myself an arduino and after researching I've bought a small round FSR, ATTiny85, nrf24l01 and 3 digit 7 segment common cathode display.
I've tried my socks off to build this project but have had no luck, any guidance/support in it's design would be appreciated.
on the receiver side will you have enough pins on the ATTiny85 to connect both the nrf24l01 and the 3 x 7 segment common cathode display?
Luck won't do it. Engineering!
(Also, socks off is a good idea. Helps avoid accidentally damaging components with electrostatic discharge. On carpet floors, it may not help much, but with wood/stone/metal floors, going bare foot means you won't need to wear an ESD protection bracelet.)
No problem. Start by posting your schematic.
Thank you to everyone so far.
To be transparent, I have no experience and couldn't offer a schematic. I'm a physiotherapist and have started the early builds that arduino uno textbook offer.
I would be happy to work with someone to support this.
OK, at least provide a block diagram showing how you imagined the whole thing would fit together. Hand-drawn is fine.
Also links to the specs of those components you purchased.
One of these, plus the receiver should work to send the signal. Keyfob 2-Button RF Remote Control - 315MHz : ID 1391 : $6.95 : Adafruit Industries, Unique & fun DIY electronics and kits
After that, it's a matter of programming the counter. TBH, I'm not a fan of separate displays these days, and I'd just as soon buy a processor board with a built in display like this: Adafruit ESP32-S2 Reverse TFT Feather : ID 5345 : $24.95 : Adafruit Industries, Unique & fun DIY electronics and kits
I should add that if you decide to go the all in one display/CPU board route, then you could use two ESP32 boards (only one needs the the display) and the ESPNOW library to communicate wirelessly between them. One thing to be aware of is that Espnow uses wi-fi, which is fairly power hungry so battery life may be an issue. I'm assuming that the need for wireless communication is because you need the pressure switch to be remote.
I have bought ATTiny85 (x4), nrf24l01 (x4), small round pressure sensor.
But if people think it will be better with different components then I'm happy to try something else.
If anyone is interested in helping, I'm happy to pay, I'm not sure what amount (I haven't got a clue what the going rate is).
Better is a matter of opinion. Depends on size, power consumption, etc. I build a lot of custom arduino based projects: Recent Work | Cedar Lake Instruments
Send me a PM (click on my avatar then click Message) if you'd like me to build it for you. It's not difficult, but a lot depends on the specifics I mentioned above.
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