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Oh Eye: Analog Inputs for Raspberry Pi


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Product Description

It isn’t an IO Board, it’s an “Oh Eye” board: sixteen 10-bit analog inputs and 8 digital inputs/outputs pulled out. It makes it easier to use the Pi as part of a special purpose appliance or musical instrument. The analog inputs are via two MCP3008 chips connected to the Raspberry Pi’s hardware SPI interface. The use of this ADC chip with the Pi is common and well documented. You may ask: “isn’t 16 channels of analog input a little overkill?” To which I would answer: yes it is, except when it isn’t. cd5a9ec388dfc7e7bce48acc2b5a430a_original

HATs are Hardware Attached on Top the Pi.

A Mess of Inputs

Once you’ve done a number of projects with a lot of potentiometers or analog sensors you’ll appreciate the handiness of the convenience headers. When you’re using analog inputs you are always running three wires to everything: power, ground, and signal. d0bf25f52455be6019d695ec6299f930_original

Attach up to 16 analog sensors like this accelerometer (left) or 8 digital inputs like this button (right).

The convenience header makes it easy to use three-wire servo cables. With these cables you get a nice solid connection that isn’t going to break at the joint over time, and you can disconnect your panel of pots when you need to. No more stripping dozens of connections (although you can still do that if you like).

A Few More Features

If you’re hooking up buttons or switches to the Pi you’ll always need a connection to ground (or power) as well, so the Oh Eye pulls out 8 digital pins with a ground rail as well. On the digital inputs, you almost always need a pullup resistor. The Raspberry Pi has internal pullups but they are weak (in the 50k range) and may be susceptible to noise. If you need a smaller value, the Oh Eye has neat pads and holes for adding through hole, SMT or a network of resistors for all your pullup needs. 430d067d6ef8c11f2e0af90fcb35da61_original The Oh Eye board comes in two variations: one with a collection of male headers and one with only the Raspberry Pi connector.

Additional Information


Raspberry Pi header only, With female headers, With male headers


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