SparkFun Button Pad 2x2 - Breakout PCB Buttons/Switches Video Surveillance The LM1117 uses the same

The LM1117 uses the same pin-out and setup as the popular LM317 adjustable regulator

Extenal power: Compact battery pack MK-SD8A(not included)

Lead-free solder is a bit harder to use (does not flow as well)

An internal 17-bit ADC and a powerful DSP contribute to the MLX90614’s high accuracy and resolution

SparkFun Button Pad 2x2 - Breakout PCB Buttons/Switches Video Surveillance The LM1117 uses the sameThis a simple breakout board for the button pads. Each LED and button is brought out to the side connectors. The connectors are soldered to the back side of the PCB. We recommend trimming the connector leads on the button side as short as possible to reduce the deflection of the pad. Now with footprints for diodes! Use the super cheap 1N4148 through hole diodes. These can be used to isolate the switches to make for a bit easier decoding. Documents: