Configuring MQ-series Gas Sensors and ADS1115 ADCs #piday #raspberrypi @Raspberry_Pi
Thanks to Phil for sharing this project with us. Check out more here.
I am finally getting around to configuring my box of MQ-series gas sensors from BangGood and ADS1115 16-bit analog to digital I2C converters from Adafruit. I had suggested I2C-compatible MQ-series sensors as a product for Adafruit, but LadyAda subtlely implied that I should go ahead and do that myself. 🙂 So here we are….
…I have nine MQ sensors to configure, and each one draws 150mA of power. To address this, I have a 10A 5v power supply from Adafruit, a 2.1mm screw terminal female jack wired with 22AWG wire to the breadboard power and ground strips, a 4-connector pigtail to split out the power to various components. This is destined for Laika, my rover, so I need to power the MQ sensors, the servo PWM driver, and the motor shield. Thus, the 1-4 pigtail. How to power all this in a portable package is a problem for another day (thinking lead acid AGM batteries at this point, which will give me 13.8v and a ton of amp hours to play with).
ADS1115 16-Bit ADC – 4 Channel with Programmable Gain Amplifier: For microcontrollers without an analog-to-digital converter or when you want a higher-precision ADC, the ADS1115 provides 16-bit precision at 860 samples/second over I2C. The chip can be configured as 4 single-ended input channels, or two differential channels. As a nice bonus, it even includes a programmable gain amplifier, up to x16, to help boost up smaller single/differential signals to the full range. We like this ADC because it can run from 2V to 5V power/logic, can measure a large range of signals and its super easy to use. It is a great general purpose 16 bit converter. Read more.
Assembled Pi T-Cobbler Plus – GPIO Breakout – for RasPi A+/B+/Pi 2/Pi 3: The Raspberry Pi B+, Pi 2 and Pi 3 have landed on the Maker World like a 40-GPIO pinned, quad-USB ported, credit card sized bomb of DIY joy. And while you can use most of our great Model B accessories by hooking up our downgrade cable, its probably a good time to upgrade your set up and accessorize using all of the Model B+’s, Pi 2’s and Pi 3’s 40 pins. Read more.
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