This project has moved to GitLab/schumar/ESP_BaPoTeSta
Using only an ESP8266 (no Atmel AVR) and a sensor, it's possible to build a very cheap and power-efficient WiFi-enabled weather station.
I've already built 3 sensors of v0.3, and around 60 of v0.5.
Right now I'm working on a major redesign of the board, and improving the firmware.
The sensors are reporting their data via MQTT, so the data can be received with OpenHAB, FHEM or a small Perl script.
"Release early, release often" -- so don't expect to be able to clone this repo and have a working IoThingy 10 minutes later :)
-> Read the source, stare at my KiCAD schematic :)
Quick calculation: 1 board would cost ca. 4.81 to 7.50 USD (excl. batteries), depending on which sensors you want. (Calculation for an order of 30 boards)
| Part | Need/Board | URL | per piece | per board |
|---|---|---|---|---|
| PCB | 1 | http://dev.dangerousprototypes.com/store/pcbs | 0.50 | 0.50 |
| PinHdr | 11 | http://www.aliexpress.com/item/x/32537378399.html | 0.01 | 0.09 |
| 1uF 1206 | 2 | http://www.aliexpress.com/store/1361740 | 0.03 | 0.06 |
| 10uF | 1 | http://www.aliexpress.com/item/x/32260294384.html | 0.07 | 0.07 |
| ESP8266 | 1 | http://www.aliexpress.com/item/x/32519328481.html | 1.93 | 1.93 |
| 10k 1206 | 10 | http://www.aliexpress.com/item/x/32569352008.html | 0.01 | 0.09 |
| 56k 1206 | 1 | http://www.aliexpress.com/item/x/32567865953.html | 0.02 | 0.02 |
| MCP1700 | 1 | http://www.aliexpress.com/item/x/32523953207.html | 0.36 | 0.36 |
| BatteryCase | 1 | http://www.aliexpress.com/item/x/2022527017.html | 1.06 | 1.06 |
| Sub-Total | 4.18 | |||
| DS18B20 | 1 | http://www.aliexpress.com/item/x/32576213069.html | 0.63 | 0.63 |
| DHT22 | 1 | http://www.aliexpress.com/item/x/32544057083.html | 2.70 | 2.70 |
| Only DS18B20 | 4.81 | |||
| Only DHT22 | 6.87 | |||
| Both | 7.50 |
see Issues
- Many thanks to all the people working on the Arduino core for ESP8266
- Cheers to jdunmire for his ESP8266 KiCAD library!