====== Pinout ======
===== Stand 2019-05-07 =====
  * Buzzer auf PIN 26
  * Servo Pin 33
  * Neopixel D25
  * Stepper auf pins 5, 16 (RX2), 32, 15
  * LoRa: 19 MISO, 23 MOSI, 18 SCK, 4 Reset, DIO1 17 (alias TX2), DIO0 14.
  * CO2: 13 RX (connect to TX on Sensor!), 12 TX (connect to RX on Sensor!)
  * Limitswitch auf pin 34

===== Evtl. alte Infos =====


ESP32-Boards: https://www.aliexpress.com/item/ESP-32-ESP-32S-Development-Board-WiFi-Bluetooth-Ultra-Low-Power-Consumption-Dual-Cores-ESP32-Board/32844181786.html

{{ :techlab:projekte:inhouse:co2-kleinserie-esp32-board.jpg?direct&200 |}}

  * LoRa: 19 MISO, 23 MOSI, 18 SCK, 4 Reset, DIO1 17 (alias TX2), DIO0 14. https://www.aliexpress.com/item/free-shipping-10pcslot-RFM95W-20dBm-100mW-868Mhz-915Mhz-DSSS-spread-spectrum-wireless-transceiver-module-SPI-SMD/32833031804.html aufgelötet auf https://www.aliexpress.com/item/10pcs-Serial-Port-WIFI-ESP8266-Module-Adapter-Plate-With-IO-Lead-Out-For-ESP-07-ESP/32881827067.html

{{ :techlab:projekte:inhouse:rfm95.jpg?direct&200 |}}

  * CO2: 13 RX (connect to TX on Sensor!), 12 TX (connect to RX on Sensor!) https://www.aliexpress.com/item/1pcs-MH-Z19-NDIR-CO2-Sensor-Module-infrared-co2-sensor-0-5000ppm/32815796002.html
  * Temp/Humidity: SDA/SCL 21/22 https://www.aliexpress.com/item/10PCS-LOT-HDC1080-module-Low-Power-GY-213V-HDC1080-High-Accuracy-Digital-Humidity-Sensor-with-Temperature/32834748951.html
  * NeoPixel: Pin 26 https://www.aliexpress.com/item/10-1000pcs-WS2812B-4pins-5050-SMD-Black-White-version-WS2812-Individually-Addressable-Digital-RGB-LED-Chip/32453497583.html
  * Servo Pin 25 https://www.aliexpress.com/item/Metal-Gear-Digital-MG90S-9g-Servo-Upgraded-SG90-High-Speed-For-Rc-Helicopter-Plane-Boat-Car/32868412353.html

===== Freie Pins =====
  * Pins 6 to 11 not recomended for use (connected to flash).
  * GPIO 0,2 special function at boot-up.
  * Pin 25 (Servo-Pin)
  * 5
  * 16 (RX2)
  * 15
  * 34,35 (nur INPUT!)

For reference: https://randomnerdtutorials.com/esp32-pinout-reference-gpios/
==== 28BYJ48 Stepper-Motor ====
Mit ULN2003 Driver Board. Auf pins 16, 17, 5, 27 und Limit-Switch mit externem Pulldown auf Pin 34.

Erste Tests sind vielversprechend. Das Ding läuft leise und erstaunlich präzise. Hat ein bisschen Spiel, verliert aber keine Schritte und kann den Limit-Switch wieder genau anfahren.

{{ :techlab:projekte:inhouse:img_20190227_222251.jpg?direct&400 | working POC}}

==== PCB ====
https://easyeda.com/Xelef2000/co2andtemp

Überarbeitete Version, mit JLCPCB-kompatiblen SMD-Teilen: https://easyeda.com/ivo.bloechliger/v1-9

==== Prototyp ====
{{ techlab:morepictures:img_20190313_162153.jpg?200 |}}
{{ techlab:morepictures:img_20190313_162338.jpg?200 |}}



====== LoRa - Config ======
Edit file project_config/lmic_project_config.h in lmic Arduino library

On https://console.thethingsnetwork.org go to Applications -> CO2-ksbg -> Add device
  * Name: tech-lab-co2-sensor-001 etc.
  * Activation Method ABP