README.md


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44

# MQTT weather station

Simple station for monitoring environmental conditions in the lab over MQTT.

Designed to work with [mqtt.chem.wisc.edu](https://mqtt.chem.wisc.edu/).

## 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.

![top](./top.png "PCB top view")

![bottom](./bottom.png "PCB bottom view")

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) |
| 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) |
| Q1             | MOSFET N-ENH     | On Semiconductor | 2N7000BU             | $0.25  | [DigiKey](https://www.digikey.com/en/products/detail/on-semiconductor/2N7000BU/976604) |
| U1             | BME680 breakout  | Adafruit         | 3660                 | $20.00 | [Adafruit](https://www.adafruit.com/product/3660) [DigiKey](https://www.digikey.com/en/products/detail/adafruit-industries-llc/3660/7915571) |

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

### A

#### Added
- initial design