Sourcekit® Atiic is an universal i2c to serial bridge. Atiic means AT commands to operate i2c devices. Check i2c.ninja to see how its AT command sets work.

PC - USB - USB-TTL - Atiic - i2c sensors (SPL06 and AHT21)

Core Instructions

1. Flash an micro SD card with latest 64-bit Raspberry OS Lite and get it running, Raspberry Pi 3B (RAM 1GB) should be enough in this application.

2. Install docker, reference: https://docs.docker.com/engine/install/debian/

   1. sudo usermod -a -G docker pi
   2. append cgroup_enable=memory in /boot/cmdline.txt
   3. system reboot

3. Install grafana-oss

   1. sudo mkdir -p /var/lib/grafana /var/lib/atiic
   2. sudo chown 472 /var/lib/grafana
   3. docker run -d -p 3000:3000 -v /var/lib/grafana:/var/lib/grafana -v /var/lib/atiic:/var/lib/atiic:ro --name=grafana --restart=unless-stopped grafana/grafana-oss:8.5.0

4. Install aguegu/Atiic

docker run -d --name=atiic --restart=unless-stopped --privileged=true -v /var/lib/atiic:/var/lib/atiic -v /dev:/dev -v /run/udev:/run/udev:ro aguegu/atiic:develop-arm64v8

5. Configure grafana

   1. Visit http://raspberrypi.local:3000 and login with admin/admin
   2. In menu Server Admin / Plugins install sqlite
   3. Configure a SQLite datasource, and click Save & Test
      • Name: Atiic
      • Path: /var/lib/atiic/database.SQLite
   4. Go to menu Dashboards and create an new Dashboard
   5. Create a dashboard with SQL:

   SELECT avg(aht21Humidity), max(ts) as _ts FROM atiic WHERE ts >= ${__from:date:seconds} AND ts < ${__to:date:seconds} group by (1000*ts/$__interval_ms)
   

6. Tweak the dashboard to the style you prefer. You may import new dashboard with this json file to get this:

Data Fields

• ts: INTEGER PRIMARY KEY, unix timestamp in seconds
• spl06Temperature: REAL, Temperature reading from SPL06, unit Celsius (°C)
• spl06Pressure: REAL, Air Pressure reading from SPL06, unit Pascal (Pa)
• aht21Temperature: REAL, Temperature reading from AHT21, unit Celsius (°C)
• aht21Humidity: REAL, Relative Humidity reading from AHT21, unit 100%
• ttl: INTEGER, measurement duration, unit milliseconds (ms)