A temp sensor connected to a fan that I use to keep my ice maker cabinet nice and cool.
I'm cross compiling from a windows box to make life easier given how slow the pi zero can be when it comes to compilation.
# Add the arm target
rustup target add armv7-unknown-linux-gnueabihf
# Build in release mode for PI
cargo build --release --target=armv7-unknown-linux-gnueabihf
There are some pretty fancy ways to deploy code but I'm just SCPing the target binary.
scp target/armv7-unknown-linux-gnueabihf/release/iceman pi@raspberrypi:~/iceman
I think systemd is the easiest way to configure and run. So for now here is my systemd service:
sudo cat /etc/systemd/system/iceman.service
[Unit]
Description=Iceman (Fan Controller)
After=multi-user.target
[Service]
EnvironmentFile=/srv/iceman/etc/env
ExecStart=/srv/iceman/bin/iceman
WorkingDirectory=/home/pi
StandardOutput=journal
StandardError=journal
Restart=always
User=pi
[Install]
WantedBy=multi-user.target
To run this I have the final iceman binary copied to /srv/iceman/bin/iceman. And then I use an env file which is kept at /srv/iceman/etc/env and loaded by systemd when iceman starts.
That env file looks like the following:
GRAFANA_API_INFLUXDB_URL=https://xxxxx.grafana.net/api/v1/push/influx/write
GRAFANA_API_USERNAME=xxxx
GRAFANA_API_PASSWORD=xxxx
NOTE: The influxdb url includes everything up to the "write" endpoint.
Here is a snapshot of my config.txt file for a PI Zero W2:
# For more options and information see
# http://rptl.io/configtxt
# Some settings may impact device functionality. See link above for details
# Enable audio (loads snd_bcm2835)
dtparam=audio=on
# Automatically load overlays for detected cameras
#camera_auto_detect=1
# Automatically load overlays for detected DSI displays
#display_auto_detect=1
# Automatically load initramfs files, if found
auto_initramfs=1
# Enable DRM VC4 V3D driver
dtoverlay=vc4-kms-v3d
max_framebuffers=2
# Don't have the firmware create an initial video= setting in cmdline.txt.
# Use the kernel's default instead.
disable_fw_kms_setup=1
# Run in 64-bit mode
arm_64bit=1
# Disable compensation for displays with overscan
disable_overscan=1
# Run as fast as firmware / board allows
arm_boost=1
# From: https://forums.raspberrypi.com/viewtopic.php?t=322591
arm_freq=800
gpu_freq=300
sdram_freq=400
[all]
dtoverlay=w1-gpio
dtoverlay=pwm
This currently sends 3 metrics to grafana:
fan_controller_cpu_temp- The PI's cpu temp which is useful for overall system healthy.fan_controller_temp- The current reported temp of the temp sensor probe.fan_controller_rpm- The current RPM of the 12v PWM fan.
MIT