BrewPi Family Arduino Uno Test

This firmware will allow you to test the setup of your BrewPi family Arduino Uno. The program will:

1. Turn the onboard LED on
2. Scan for an I2C device. It will use A0 for sensor tests if the scan finds an I2C device; otherwise, it will use the original A4 pin for sensors. If the program detects an I2C LCD, a test message will display
3. Check the OneWire
   1. Display if parasitic sensors are present on the bus
   2. Display the number and type of sensors found
   3. Display the address and current temperature for each sensor
4. Test the heat and cool relays (pins 5 and 6)
5. Clear the EEPROM to avoid issues saving the sensors later on

It will automatically check for an I2C display, and if found, will show a test on the display. It will then scan the proper pin for the variant; A4 if no I2C is detected, and A0 if an I2C is present.

Results using a standard or parallel LCD system:

BrewPi Family Arduino Uno Test beginning.

Scanning I2C bus.
No I2C devices found.
I2C scan complete.

Checking 18 for OneWire devices.
Parasitic power is off for the OneWire bus on pin 18.
Detected 2 devices on pin 18.
Device 18:0 is a DS18B20 device.
Device 18:1 is a DS18B20 device.
Sensor: 18:0    Address: 28:EE:7E:28:2C:15:0:BB Temperature: 18.94°C
Sensor: 18:1    Address: 28:EE:B1:35:23:15:0:C  Temperature: 21.62°C

Testing relay pin 5.
Turning pin 5 on.
Turning pin 5 off.
Relay test on pin 5 complete.

Testing relay pin 6.
Turning pin 6 on.
Turning pin 6 off.
Relay test on pin 6 complete.

Clearing EEPROM.
EEPROM clear complete.

BrewPi Family Arduino Uno Test complete.

Results using an I2C LCD system:

BrewPi Family Arduino Uno Test beginning.

Scanning I2C bus.
I2C device found at address 0x3F.
Setting LCD display at 0x3F.
I2C scan complete.

Checking 14 for OneWire devices.
Parasitic power is off for the OneWire bus on pin 14.
Detected 2 devices on pin 14.
Device 14:0 is a DS18B20 device.
Device 14:1 is a DS18B20 device.
Sensor: 14:0    Address: 28:EE:7E:28:2C:15:0:BB Temperature: 19.00°C
Sensor: 14:1    Address: 28:EE:B1:35:23:15:0:C  Temperature: 19.31°C

Testing relay pin 5.
Turning relay on pin 5 on.
Turning relay on pin 5 off.
Relay test on pin 5 complete.

Testing relay pin 6.
Turning relay on pin 6 on.
Turning relay on pin 6 off.
Relay test on pin 6 complete.

Clearing EEPROM.
EEPROM clear complete.

BrewPi Family Arduino Uno Test complete.

Flashing from Internet

Provided your Pi has avrdude installed (which is installed as part of BrewPi,) you may issue a few commands to download and flash the test firmware. If you do not have BrewPi installed, be sure to install avrdude manually:

sudo apt install avrdude

Find Port

You will need the path to the serial port used by the Arduino Uno. Assuming you have BrewPi installed, you may leverage some of the installed libraries to find the path to that port:

1. Change to the BrewPi user: sudo su - brewpi
2. Activate the virtual environment: activate
3. List compatible serial ports (command is all one line): python -c 'from autoSerial import find_compatible_serial_ports as fp; print(list(fp()))'

Example:

(bpr) brewpi@brewpi:~ $ python -c 'from autoSerial import find_compatible_serial_ports as fp; print(list(fp()))'
[('/dev/ttyUSB0', 'Arduino Uno')]

In this case, /dev/ttyUSB0 is the only Arduino Uno found. If there is more than one, a list will be printed. Pick the /dev/* device you wish to manipulate.

If you do not have BrewPi installed, you will have to find the port independently.

BrewPi Wiring Test

Download the wiring test firmware to your home directory:

curl -O https://github.com/brewpi-remix/uno-test/raw/main/firmware/firmware.hex -o "/home/pi/firmware.hex"

Flash the test firmware (remember to change the serial port in the -P argument below):

/usr/share/arduino/hardware/tools/avrdude -F -e -p atmega328p -c arduino -b 115200 -P /dev/ttyUSB0 -U flash:w:"/home/pi/firmware.hex" -C "/usr/share/arduino/hardware/tools/avrdude.conf"

If you receive a "command not found error" try this version:

avrdude -F -e -p atmega328p -c arduino -b 115200 -P /dev/ttyUSB0 -U flash:w:"/home/pi/firmware.hex" -C "/etc/avrdude.conf"

Blank Uno

To blank the Uno, download the blank firmware to your home directory:

curl -O https://github.com/brewpi-remix/uno-test/raw/main/firmware/blank.hex -o "/home/pi/blank.hex"

Flash the blank firmware (remember to change the serial port in the -P argument below):

/usr/share/arduino/hardware/tools/avrdude -F -e -p atmega328p -c arduino -b 115200 -P /dev/ttyUSB0 -U flash:w:"/home/pi/blank.hex" -C "/usr/share/arduino/hardware/tools/avrdude.conf"

If you receive a "command not found error," try this version:

avrdude -F -e -p atmega328p -c arduino -b 115200 -P /dev/ttyUSB0 -U flash:w:"/home/pi/firmware.hex" -C "/etc/avrdude.conf"