Raspberry Pi
The Raspberry Pi is a small single-board computer known for allowing to hack with hardware thanks to it's general purpose input/output (GPIO) pin header. The computer also has an Audio input/output, but the GPIO header has no analog-to-digital (ADC) converters. It can however be interfaced to any custom extension boards with 3V3 logic.
For further information, go to the English wikipedia article about the Raspberry Pi
How to use a Raspberry for analog data aquisition
The Raspberry Pi does not have a general purpose Analog-to-Digital (ADC) or Digital-to-Analog (DAC) converter available on the GPIO pins. There are *hats* available which provide the neccessary hardware, for instance
- https://bc-robotics.com/shop/16-channel-analog-input-hat-for-raspberry-pi/ (USD 14)
- https://www.seeedstudio.com/8-Channel-12-Bit-ADC-for-Raspberry-Pi-STM32F030.html (USD 9.90)
The GPIO pins of the Raspberry Pi have CMOS logic levels (3.3V). Note that this is incompatible to TTL or +-10V logic level of the THAT! Don't wire your THAT to the Raspberry Pi without logic conversion, otherwise you'll certainly break your poor Raspberry.
The Raspberry Pi has Analog output, realized with PWM (pulse width modulation). This is not high quality but can be used for feeding analog data into THAT.
Efforts of connecting The Analog Thing to a Raspberry Pi
Please collect your efforts of connecting The Analog Thing to a Raspberry Pi at this point!
Photos
Typical Raspberry Pi (2B) with connectors.
In this revion, the Audio input clearly stands out as blue 3,5mm jack
Same computer, different form factor (RPI Zero)
Even another form factor (RPI Compute Module)
Yet another form factor (RPI Pico)
Schematics and Drawings
Drawing
GPIO headout
Basic circuitery with the GPIO
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