https://github.com/johntalton/ds3502

Digital Potentiometer (POT)
https://github.com/johntalton/ds3502

ds3502 i2c pot potentiometer

Last synced: 4 months ago
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Digital Potentiometer (POT)

• Host: GitHub
• URL: https://github.com/johntalton/ds3502
• Owner: johntalton
• License: mit
• Created: 2020-07-05T20:27:48.000Z (almost 6 years ago)
• Default Branch: main
• Last Pushed: 2025-09-24T05:08:00.000Z (9 months ago)
• Last Synced: 2025-09-24T07:09:01.157Z (9 months ago)
• Topics: ds3502, i2c, pot, potentiometer
• Language: JavaScript
• Homepage:
• Size: 85.9 KB
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# DS3502

Digital Potentiometer (POT)

[![npm Version](http://img.shields.io/npm/v/@johntalton/ds3502.svg)](https://www.npmjs.com/package/@johntalton/ds3502)

![GitHub package.json version](https://img.shields.io/github/package-json/v/johntalton/ds3502)

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## :gear: Operation

The Digital Potentiometer uses a resistor array to achieve a 0-127 step range between its high (RH) and low value (RL).  In most cases these are wired to the same logic high and low.  Thus, providing a POT output (on RW) for analog usage in the RH-RL range.

In addition to the controllable wiper value (via WR) the device provides the ability to set the initialization value on startup.  This is provided via a `mode` change such that writes to the wiper value are preserved in a persistent storage on the chip (withing IVR on the EEPROM).

This set-and-update `mode` while useful for setting persistent values over power loss also comes with increased delay in update.

:warning: `mode changes to the control register (CR) do not take effect until the next write phase`

:warning: `it is not recommended to update both CR and WR in a single update, although it is supported`

## :book: Example

```javascript

import { I2CAddressedBus } from '@johntalton/and-other-delights'

import { DS3502 } from '@johntalton/ds3502'

const bus = /* I2CBus */

const device = new  DS3502.from(new I2CAddressedBus(bus, 0x28))

const { persist } = await device.getControl()

await device.setWiper(42)

```