I have stock of some very nice Waveshare 7.5" E-paper panels with bonded glass and black border. They are very cool. I made a driver board to fit on the back, and it works well. It is on Tindie.
I then made a new board with NFC reader through the glass which is very cool. I use for access control on the front door. But I think it can work as a card and so work as a WiFi NDEF NFC even - need to work on code for that.
But I am working on the next version, and am interested in comments.
- ESP32-S3-MINI-1-N4-R2 (Dual CPU, 4M flash, 2M SPI RAM).
- E-paper panel controller and power, obviously.
- Micro SD card slot.
- Power from USB-C (two positions) or WAGO DC 5V-17V.
- Designed to work with button-fix clip on the back to mount easily on a wall.
- 24 WS2812 RGB LEDs around the edge, plus one for status by SD slot, and one general status.
- 2 pin WAGO contact input (e.g. for doorbell push).
- PN532 NFC compatible with DESFire, and can work as a card to NDEF WiFi details, etc.
- Separate WAGO power and control for PN532, and connected internally to allow local working.
But the new bits are...
- SCD41 CO₂ and humidity (and temperature).
- SHT40 temperature.
- GZP6816D atmospheric pressure.
- T3902 MEMS microphone for sound.
- DS18B20 connection for external temperature sensors (WAGO).
- Updated WS2812 LEDs that don't get easily knocked off the board.
- Switched power control for PN532.
- Switched power control for E-Paper.
- Switched power output 3.3V (WAGO)
This adds some cost, but I think makes for a pretty awesome controller.
What do you think? (Update - I have ordered some)
Is 8GB an option? Especially with all those extra sensors... Patrick
ReplyDeleteReall? My code has no trouble. Do you a specific module. I would not want to lose the extra RAM
DeleteAlso - interested in your reasoning/choice of temp/pressure? I use a BME280 in my stuff. Single device, for all three measurements. Patrick
ReplyDeleteI have not tried that yet. Temperature is always a pain on PCB, but this should be quite good on the SCD41. The pressure sensor does temp too but seems less reliable.
DeleteWe have a bunch of Joan (https://getjoan.com/shop/joan-6-re/) meeting room displays that we use with Teams. We've been considering making our own with some open source hardware. You've just given me the idea of using NFC with our existing door passes for room booking.
ReplyDeleteAh nice idea - I have now coded NFC card to serve a URL, but you can with QR as well. Do let me know if you want some panels and boards...
ReplyDelete