search

BitcoinTaps / partytap

LNbits extension for the BitcoinTaps PartyTap
https://www.bitcointaps.com/
MIT License
1 stars 1 forks source link

How to get NFC working? #1

Open ulrichard opened 7 months ago

ulrichard commented 7 months ago

I flashed the firmware out of the lnbits plugin, it says "BitcoinTaps PartyTap (version 827652 ) " Looking up the PINS in https://forum.arduino.cc/t/esp32-sunton-esp32-3248s035-i2c/1188634 I connected the I2P pins of the NFC reader to GPIO21 and GPIO 22. The NFC reader is : https://www.alibitress.com/item/1005006162306429.html

I can generate QR code invoices on the device, but when I hold my BoltCard to the NFC reader, nothing happens. Could it be that version 827652 is too old for NFC?

pieterjm commented 7 months ago

Version 827652 does not have NFC support. For that you need version 834087 or higher.

In addition to that, to get NFC completely working, you'll need an additional component that converts I2C to servo signals. At this time of writing, I did not publish the details of that component. That will be soon (TM). It basically consists of an ATTiny that bridges I2C to servo signal. I'm working on a small PCB that contains all required components and connectors that make building the device a bit easier.

A prototype is shown in the screenshot below. IMG_9922

ulrichard commented 7 months ago

Thanks for the infos. I want to use it for a candy grabber. For this I don't need a servo, but a simple digital pin output is enough. If this digital signal could be provided at GPIO35 on the other connector, then I wouldn't need the ATTiny.

ulrichard commented 1 month ago

@pieterjm I saw that the current firmware has NFC support, and allows the user to select different actuator modes. But "Relay, Time" uses pin 21 for the relay, and in this mode the NFC reader is not initialized, most likely because of the conflicting pin. Is there a reason why pin 35 could not be used for the relais, and thus freeing up the I2C bus for reading from NFC?

pieterjm commented 1 month ago

To my knowledge GPIO35 is an input-only pin

ulrichard commented 1 month ago

Ah too bad. What about one of the UART pins that are exposed on the third connector. Could one of them be used for the relais, when disabling the UART?

pieterjm commented 1 month ago

I looked into that and it is not really an option. Sorry