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Description

Here you can find information to the implementation and maintenance of connection-devices such as analog to digital converters.

Note

Only devices we tested are listed here.

If you have tested some on your own and want to contribute your know-how => send us the information to contact@growautomation.eu

Please include at least the information you see listed in the existing devices below.

Devices

ADS1115

ads1115

Tags

  • NATIVE

  • SOLDERING

  • 3.3V

  • 4 INPUTS

  • 2 GPIO

Dependencies

  • apt

    • python3-smbus

    • i2c-tools

  • pip

    • adafruit-circuitpython-ads1x15

  • privileges

    • executing user must be a member of:

      • group gpio (usermod -a -G gpio USERNAME)

      • group i2c (usermod -a -G i2c USERNAME)

  • raspi-config

    • i2c must be enabled (raspi-config nonint do_i2c 0)

Config

Device model
Device

  • Connection:

    • If empty => the default i2c will be used

    • Else => ga_json[scl=GPIO_PIN,sda=GPIO_PIN]

Implementation

You will have to solder the pins to the pcb.

GA supports this converter natively.

Wiring

See also: raspberry pi i2c pinout

Power

  • VDD => 5V power supply

  • GND => ground

Connections to raspberry

  • SDA => GPIO #0, #2 or any free default gpio

  • SCL => GPIO #1, #3 or any free default gpio

Connections to analogue sensors

  • A0 to A3 => analogue out of the sensor

Issues

The contacts are sensitive to corrosion.

You would want to seal it by covering it with epoxy resin.

MCP3008

mcp3008

Tags

  • NATIVE

  • 3.3V

  • 8 INPUTS

  • 4 GPIO

Links

Dependencies

  • apt

    • python3-smbus

  • pip

    • adafruit-circuitpython-mcp3xxx

  • privileges

    • executing user must be a member of:

      • group gpio (usermod -a -G gpio USERNAME)

      • group spi (usermod -a -G spi USERNAME)

  • raspi-config

    • spi must be enabled (raspi-config nonint do_spi 0)

Config

Device model

  • Script: mcp3008.py

  • Script argument: spi number

    • If empty => the default spi will be used

Device

  • Connection: GPIO_PIN

Implementation

GA supports this converter natively.

Wiring

mcp3008_pin

See also: raspberry pi spi pinout

Power

  • VDD => 3.3V power supply

  • VREF => 3.3V power supply

  • AGND => ground

  • DGND => ground

Connections to raspberry

  • CLK => GPIO #11 or #21

  • CS => any free default gpio-pin

  • DIN => GPIO #9 or # 19

  • DOUT => GPIO #10 or #20

Connections to analogue sensors

  • CH0 to CH7 => analogue out of the sensor

Issues

Multiple spi-clients per bus were not successfully tested yet (spi would support it when using a cs-pin per client-device => see per example)