Step 3: Pull-Up Resistors
You will now be soldering four 3kΩ resistors to R1, R2,  R19, and R20. These are pull-up resistors to hold the output of the comparator high.
This is because ICs are usually better at sinking current rather then sourcing.
Tools Needed
- Soldering iron
- Cutter
Parts Needed
- 4 x 3kΩ resistors
Instructions
- Find the resistor footprints on the board. R1, R2, R19, and R20 are grouped together next to the Propeller socket.
- Install the resistors into their footprints.
- Solder them into place.
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