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# MQTT weather station
Simple station for monitoring environmental conditions in the lab over MQTT.
Based on the Bosch's [BME280 humidity, pressure, and temperature sensor](https://www.bosch-sensortec.com/products/environmental-sensors/humidity-sensors-bme280/).
Using Adafruit's [breakout board](https://www.adafruit.com/product/2652).
Designed to work with [mqtt.chem.wisc.edu](https://mqtt.chem.wisc.edu/).
## Repository
This is an open source hardware project licensed under the CERN Open Hardware Licence Version 2 - Permissive.
Please see the LICENSE file for the complete license.
This repository is being mirrored to several version control systems in an attempt to ensure maximum avaliability.
| name | url |
| -------------- | ------------------------------------------------------------- |
| Chem (primary) | https://git.chem.wisc.edu/shop/mqtt-weather-station |
| GitHub | https://github.com/uw-madison-chem-shops/mqtt-weather-station |
| GitLab | https://gitlab.com/uw-madison-chem-shops/mqtt-weather-station |
## PCB
This PCB was designed using KiCAD version 5.
Refer to `weather.pdf` for schematic.
PCB images generated with [tracespace](https://github.com/tracespace/tracespace) follow.
<img src="./weather-.top.svg" width="100%"/>
<img src="./weather-.bottom.svg" width="100%"/>
## Bill of Materials
| reference | value | manufacturer | part number | price | vendors |
| :------------- | :--------------- | :--------------- | :------------------- | :----- | :------ |
| A1 | ESP8266 breakout | Adafruit | 2471 | $10.00 | [Adafruit](https://www.adafruit.com/product/2471) [DigiKey](https://www.digikey.com/en/products/detail/adafruit-industries-llc/2471/5355489) |
| C1 | 100u | Illinois Cap. | 107KXM025M | $0.25 | [DigiKey](https://www.digikey.com/en/products/detail/illinois-capacitor/107KXM025M/5410757?s=N4IgTCBcDaIIwAYDsBpAGgWQWArBkAugL5A) |
| C2 | 10u | Yageo | CC1206KKX7R8BB106 | $0.25 | [DigiKey](https://www.digikey.com/en/products/detail/yageo/CC1206KKX7R8BB106/5195365?s=N4IgTCBcDaIMJwIxgAwDYDSGAaB2ASgBwBCxi6IAugL5A) |
| C3 | 22u | Yageo | CC1206MKX7R7BB226 | $0.75 | [DigiKey](https://www.digikey.com/en/products/detail/yageo/CC1206MKX7R7BB226/7071713?s=N4IgTCBcDaIMJwIxgAwDYCyBpAGgdgCU8AhYsMNEAXQF8g) |
| C4 | 1n |
| C5 | 1u |
| D1, D2 | red LED | Lite-ON | LTST-C230KRKT | $0.50 | [DigiKey](https://www.digikey.com/en/products/detail/lite-on-inc/LTST-C230KRKT/386857?s=N4IgTCBcDaIDIBUDKCC0BhMBmADAaQCU8EQBdAXyA) |
| J1 | barrel jack |
| PS1 | VXO7805-500-M |
| Q1, Q2 | MOSFET N-ENH | Diodes Inc. | 2N7002K-7 | $0.25 | [DigiKey](https://www.digikey.com/en/products/detail/diodes-incorporated/2N7002K-7/1934378?lang=en&s=N4IgTCBcDa4HIHYAMSwGkC0CQF0C%2BQA&site=us&x=17&y=13) [Mouser](https://www.mouser.com/ProductDetail/Diodes-Incorporated/2N7002K-7?qs=rGAXPo9uwV0%2Fp9r5KJ7huA%3D%3D) |
| R1, R2 | 1k |
| R3, R4, R7, R8 | 4.7k |
| R5 | 470k |
| R6, R9 | 1 |
| U1 | BME280 breakout | Adafruit | 2652 | $20.00 | [Adafruit](https://www.adafruit.com/product/2652) [DigiKey]() |
| U2 | counter | TI | CD4060BM96 | $0.50 |
All prices are extended.
Assuming an order of 10 PCBs, the boards themselves should cost around $5 each.
## Firmware
This project uses [micropython](https://micropython.org/), specifically [microhomie](https://github.com/microhomie/microhomie).
Refer to the "firmware" directory in this repository for detailed instructions.
## Changelog
### Unprinted
### B
#### Added
- new hour long reset timer based on CD4060BM96
#### Changed
- SOT23 packages for all discrete transistors
### A
#### Added
- initial design
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