Hook Up Encoders

[infinityspike]

Description

The encoders use 2 optical switches with their LEDs in series with a 51 ohm resistor. Due to the pre-fabricated PCB that these live on the diode's power supply and the phonologic circuit have the same voltage source. We can underplot the photologic circuit to about 3.5 volts before seeing erratic behavior, but we must have enough voltage to send around 20mA (50mA MAX) to the LEDs.

Difficulty: [Medium]

Expected Completion Date: [2026-1-27]

Related Issues

[infinityspike]

Due to the MCP2317s I2C lines being linked, and at a higher voltage than the raspberry pi can accept, this issue is related to #25 as the voltage source is intertwined.

[infinityspike]

Due to the current flow through the LEDs, photologic circuits and MCP23017s, we'd either need a well tuned voltage divider to achieve the necessary ~4 volts, or we get a dedicated LDO voltage regulator.

Or we do a buck converter, which would necessitate encolsure space.

[infinityspike]

The SHED does not have any variable voltage regulators... D: we will have to purchase or design our own regulator.

[infinityspike]

Professor Kiser had mentioned a zener diode combined with a capacitor for regulating down to 4 volts