sandeepmistry/arduino-nRF5

nRF52 ADC External Support

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#353 opened on Apr 4, 2019

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bughelp wanted

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Description

Hello! Thank you for this wonderful support for the board nrf52 ble in Arduino Platform!

I'm reading from the ADC input but I'm reading around 20-30mV from actual value. Default ref is set to 3V right?

If I will use a LM4040 (2.048 / .1%) for external reference will that lower my errors in ADC reading (I had used this before with arduino uno with reading resistances and had accurate results) ? I'm not certain if this is cause by the internal ADC or by the internal REF voltage.

Do you have a plan to add support for external AREF on P0.02 of nrf52?

TIA.

Contributor guide

Research direction
Investigate the nRF52 ADC driver in the Arduino core to add support for external reference voltage on pin P0.02, likely by modifying the analogReference() function or pin configuration.
Tech stack
c
Domain
embedded iot
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Mostly clear
Prerequisites
ArduinonRF5 SDKADC fundamentals
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40