https://github.com/jimmadge/semis
🌱 A greenhouse climate monitor using Arduino, BME280 and ST7789
https://github.com/jimmadge/semis
arduino bme280 maker pimoroni st7789
Last synced: about 1 year ago
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🌱 A greenhouse climate monitor using Arduino, BME280 and ST7789
- Host: GitHub
- URL: https://github.com/jimmadge/semis
- Owner: JimMadge
- License: mit
- Created: 2021-03-18T19:18:38.000Z (about 5 years ago)
- Default Branch: main
- Last Pushed: 2021-07-14T14:44:26.000Z (almost 5 years ago)
- Last Synced: 2025-01-12T23:44:16.057Z (over 1 year ago)
- Topics: arduino, bme280, maker, pimoroni, st7789
- Language: C++
- Homepage:
- Size: 1.97 MB
- Stars: 1
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# 🌱 Semis 🌱
A greenhouse climate monitor using Arduino, BME280 and ST7789
- Temperature, humidity and pressure readings
- Display activated by a button to save power
- Minimum and maximum temperature with reset button
Here is an example using an [Arduino
Nano](https://store.arduino.cc/arduino-nano) built on an [Adafruit perma-proto
board](https://www.adafruit.com/product/571) (excuse my messy soldering!):
## Components
- Arduino AVR based board, _e.g._ Uno/Nano/Leonardo/Micro
- [Pimoroni BME280](https://shop.pimoroni.com/products/bme280-breakout)
- [Pimoroni 1.3" SPI Colour LCD
(240x240)](https://shop.pimoroni.com/products/1-3-spi-colour-lcd-240x240-breakout)
(ST7789)
- Two switch buttons
Equivalent BME280 and ST7789 breakout boards (or even building your own from
more basic components) may also work but I have not tested.
The essential features are,
- I2C interface to the BME280
- SPI interface to the ST7789
- PWM control of the ST7789 backlight
## Connections
The BME280 is controlled over I2C so the SDA and SCL pins of the breakout board
should be connected to SDA (A4) and SCL (A5) pins of the Arduino respectively.
The ST7789 is controlled over SPI so the SCK and MOSI pins of the breakout must
be connected to the Arduino SCK and MOSI pins (13 and 11 respectively). The CS
and DC pins can be connected to any digital pins, 10 and 9 by default. The BL
pin should be connected to a PWM pin (to allow dimming of the display), 3 by
default. If your breakout has a RST pin this is not used.
The display and min/max reset buttons are connected as pull-up inputs. The
default pins are 7 and 8 respectively.
In summary the default pins are,
- BME280
- SDA - SDA (A4)
- SCL - SCL (A5)
- ST7789
- CS - 10
- SCK - SCK (13)
- MOSI - MOSI (11)
- DC - 9
- BL - 3
- display button - 7
- min/max reset button - 8
## Building and installation
Using [`arduino-cli`](https://arduino.github.io/arduino-cli/latest/), ensure
that the AVR core is installed
```
$ arduino-cli core install arduino:avr
```
Install the dependencies
```
$ arduino-cli lib install "Adafruit ST7735 and ST7789 Library" BME280
```
Configure [`semis/semis.ino`](semis/semis.ino) with your text editor. In
particular you might want to adjust
- `TFT_ROTATATION` - Rotates the image on the TFT to suit its orientation
- `TFT_ON` - Brightness of TFT when on, this is an `int` in the range `0-255`
- `DISPLAY_PIN` and `RESET_PIN` - The digital pins which the display on and
min/max reset switches are connected to respectively
Get the port path and fqbn of your board, for example
```
$ arduino-cli board list
Port Type Board Name FQBN Core
/dev/ttyACM0 Serial Port (USB) Arduino Uno arduino:avr:uno arduino:avr
```
Build the program
```
$ arduino-cli complie -b semis
```
where `` is the fully qualified board name for your Arduino board that
you got in the previous step.
Upload the program to your Arduino
```
$ arduino-cli upload -b -p semis
```
where `` and `` are the fully qualified board name and port path of
your Arduino board.