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https://github.com/2qx/esp32-load-provision

Provision a load with a varying voltage randomly across an array.
https://github.com/2qx/esp32-load-provision

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Provision a load with a varying voltage randomly across an array.

Host: GitHub
URL: https://github.com/2qx/esp32-load-provision
Owner: 2qx
Created: 2023-04-07T15:18:04.000Z (over 1 year ago)
Default Branch: master
Last Pushed: 2023-04-07T16:28:45.000Z (over 1 year ago)
Last Synced: 2023-08-17T04:12:52.518Z (over 1 year ago)
Language: Python
Size: 91.8 KB
Stars: 0
Watchers: 2
Forks: 0
Open Issues: 0
Metadata Files:
- Readme: README.md

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README

This is a rough sketch of a circuit and scheme to provision an led array for a varying voltage input.

[Try it out on Wokwi](https://wokwi.com/projects/361196616225053697)

![Potentiometer, led, NeoArray, ESP32 and Display](docs/schematic.png "Schematic")

The microcontroller (ESP32) uses a simple read from an analog pin to estimate the current voltage. The potentiometer reading is mapped from 0-3.3V to 12-21V to simulate a higher voltage circuit.

The simulation doesn't factor in voltage drops from additional loads; in real life, provisioning more load would result in a slight voltage drop. Additionally, slight variability in the load may cause the need for load to be constantly toggled.

To address this, a simple low voltage disconnect scheme was applied to provision loads, at random, but only when the voltage changed significancy outside of the provided range.

![Provisioning and low voltage disconnect scheme](docs/lvd_fn.png "Provisioning Schema")

***

With a simulated voltage drop of 0.01 volt per micro-load, the control loop needed several iterations to account for large adjustments in voltage.

In addition, this sketch used an infinite loop to poll voltage every second. In reality, a voltage monitor on an interrupt for both up and down would be necessary to handle rapid changes in input.