{"id":745,"date":"2019-06-14T20:26:29","date_gmt":"2019-06-15T03:26:29","guid":{"rendered":"https:\/\/doubleecpu.com\/?page_id=745"},"modified":"2019-06-15T21:05:58","modified_gmt":"2019-06-16T04:05:58","slug":"pi-16adc","status":"publish","type":"page","link":"https:\/\/doubleecpu.com\/index.php\/raspberrypi3bsensors\/pi-16adc\/","title":{"rendered":"Pi-16ADC"},"content":{"rendered":"\n

Raspberry Pi HAT (expansion board) designed for the Raspberry Pi B model 40 pin connector. Pi-16ADC uses a LTC2497 <\/a>chip that adds sixteen (16) single end or 8 differential Analog to Digital Converter (ADC) ports for collecting data from analog sensors or devices. With a sampling Data resolution 16 bits on all 16 ports. Sample code in Python is available to program analog sensor connections to a Raspberry Pi over an I2C address if needed. Solder-less connections via screw down terminal block and additional solder points are provided for each input channel and ground. <\/p>\n\n\n\n

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Pi-16ADC<\/figcaption><\/figure>\n\n\n\n

Features<\/h3>\n\n\n\n

Each terminal block connection is paired as Channel-Ground. (ex: Channel-0 and Ground is in the top left corner. Channel-1 and Ground is the next pair going clockwise). *To minimize spurious readings and stray noise pickup, it is recommended to use the channel-ground pair as provided. It is also recommended to connect unused channels to the ground with a short jumper wire when a channel is not in use.
All terminal block connections are marked on the board. Each terminal block Channel also has a corresponding solder point next to it. These are also labelled and are shown below.<\/p>\n\n\n\n

Setup<\/h3>\n\n\n\n

Pi-16ADC communicates with the Raspberry Pi using the I2C bus.
To set the address, 3 jumpers A0, A1 and A2 are provided.
Each jumper can be
1) Connected to +5V \u2013 state defined as \u201cHigh\u201d.
2) Connected to Ground \u2013 stated defined as \u201cLow\u201d.
3) Removed \u2013 state defined as \u201cFloat\u201d.
27 possible addresses can be defined using the I2C address jumpers (listed in sample code).
Check I2C<\/a> <\/a>is Setup<\/p>\n\n\n\n

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The default address is 0x76 (A0=High, A1=High, A2=High) <\/figcaption><\/figure>\n\n\n\n

Clone Repository or Download Code<\/a>
git clone https:\/\/github.com\/gilmedel\/Pi-16ADC<\/a>
The python code uses time, smbus, sys, os, subprocess python scripts. Starts by initializing the i2c bus, address, and channel to be used, sets reference variables used for Voltage, reading, <\/p>\n\n\n\n

Connect Analog Sensor<\/h3>\n\n\n\n

Connect analog sensor output to channel0 on the terminal block connector and common ground. The signal must be between .2-2.5V (-2.5 to 2.5 V for differential comparison) <\/p>\n\n\n\n

To run code from Terminal setup a virtual environment for Python and activate and install any missing dependancies<\/p>\n\n\n\n

python3 -m venv pi16_test-env\nsource pi16_test-env\/bin\/activate\npip install smbus\npython3 pi16adc_test.py<\/pre>\n\n\n\n
\"Running
Running Test python code<\/figcaption><\/figure>\n\n\n\n
In this example a soil moisture sensor is connected. <\/p>\n","protected":false},"excerpt":{"rendered":"
Raspberry Pi HAT (expansion board) designed for the Raspberry Pi B model 40 pin connector. Pi-16ADC uses a LTC2497 chip that adds sixteen (16) single end or 8 differential Analog to Digital Converter (ADC) ports for collecting data from analog sensors or devices. With a sampling Data resolution 16 bits on all 16 ports. Sample … <\/p>\n
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