Now we will be adding four 1kΩ resistors to R16, R18, R21, and R23, and two 3kΩ resistors to R17 and R22. Together these resistors form two voltage ladders, which create threshold voltages for the comparator.

INSERT IMAGE OF VOLTAGE LADDER

Tools Needed

1. Soldering iron
2. Cutter

Parts Needed

• 4 x 1kΩ resistors
   
• 2 x 3kΩ resistors
   

Instructions

1. Find the resistor footprints for the voltage ladder on the board, next to the comparator socket.
    
2. R17 and R22 are nestled in between the other resistors. Don't get them confused!
   
3. Then install R1, R2, R19, and R20. These go right around R17 and R22.
   
4. Bend the leads of all of these resistors and solder them at the same time.