Precision Voltage Reference - Arduino ADC External Aref Input

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PCBWay Supports High Precision Advanced PCBs: https://www.pcbway.com/
0:00 Intro
0:15 Schematic Overview and Project Scope
2:36 Ordering PCBs and Solder Paste Stencil from PCBWay
3:50 Hot Plate Reflow Soldering
5:11 Multimeter test measuring resistors and capacitors
5:50 Test boost converter output
6:00 Calculate Precision Voltage Reference Current Limit Resistor
8:06 Calculate Adjustable Output Voltage Reference Resistors
9:10 Why to use External Vref on an ADC
11:50 Arduino Uno ADC Example with default 5V vs External 2.5V Reference Voltage

This PCB uses LM4040 and LM4041 Precision Voltage References (fixed and adjustable) in a dev board configuration so resistors can be swapped for experimentation.

A 2.5v reference is used in an experiment to show how more resolution can be achieved on the Uno 10 bit ADC compared to using the default 5 volt reference.

For convenience, the PCB also has an on board boost regulator if needed for experimenting when only lower voltage power sources are available, and there are some high precision resistors and capacitors to provide a set of reference components for checking multimeters.

Sketch & Schematic:
https://github.com/GadgetReboot/misc_file_bin/tree/master/2021_03

Equipment used in this project (support the channel by shopping through these affiliate links!):
946C Solder Hot Plate 200mm x 200mm https://www.banggood.com/custlink/K3DyiNZy0l
ANENG AN8008 True RMS Multimeter https://www.banggood.com/custlink/KKDh9267Fz
Minleaf NPS3010W Power Supply https://www.banggood.com/custlink/KKKdtaNN9A
FY6900 Dual Channel 60MHZ Signal Generator https://www.banggood.com/custlink/vGKR9r6RkR
Siglent SDS1104X-E 100Mhz Digital Oscilloscope 4 Channels Standard decoder
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Dual Channel Digital Thermometer with Two K- Type Thermocouples LCD Backlight
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Related Videos:
946C Soldering Hot Plate Review: https://youtu.be/g51xTKOXkk0
Feeltech FY6900 60MHz Arbitrary Function Generator Review: https://youtu.be/pOSEm8VeXAU
Minleaf NPS3010W Power Supply Review: https://youtu.be/eQtSriqOJvo

Reference Material:
LM4041 Datasheet and App Note
https://www.ti.com/lit/ds/symlink/lm4041-n-q1.pdf
https://www.ti.com/lit/eb/slyc147/slyc147.pdf
Online Scientific Calculator https://www.desmos.com/scientific
Online Equation Editor http://www.sciweavers.org/free-online-latex-equation-editor
Freescale ADC Accuracy App note https://www.nxp.com/docs/en/application-note/AN5250.pdf
Function Graphing https://www.mathopenref.com/graphfunctions.html

Support me on Patreon: https://www.patreon.com/gadgetreboot
LBRY/Odysee: https://odysee.com/@GadgetReboot:4
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