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Voltage Reference With Arduino Pro Mini

Linearize and Calibrate Your Analog Inputs

Voltage Reference With Arduino Pro Mini
Voltage Reference With Arduino Pro Mini
If you use the analog inputs of your favorite microcontrollers, sooner or later you have needed to check their linearity and accuracy over the entire range of input values. This precise and compact Arduino-based voltage calibrator, capable of generating stable and accurate reference voltages in the range from 0 to 5 volts, will solve this problem.

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Materials

Component list

DVM Component List

Resistors

R1 = 82 Ω, ±5%, 1 W , see text
R2, R3 = 510 Ω, ±1%, ¼ W

Rp1 = 22 kΩ, trimmer

 

Capacitors

C1, C4 = 100 nF, 50 V, ceramic
C2 = 10 μF, 25 V, tantalum
C3 = 1 μF, 63 V, ceramic
C5 = 47 nF, 63 V, polyester

 

Modules

1 x Arduino Pro Mini (or compatible)

1 x 16x2 LCD display, with backlighting

1 x ADS1115 A/D converter

 

Miscellaneous

12+12+10+16 Pin Strip, female

 

Voltage Source Component List

Resistors

R1 = 3 kΩ, 1%, ¼ W
R2, R3 = 10 kΩ, 1%, ¼ W

R4 = 100 Ω, 5% 3 W, wire wound

Rp1 = 10 kΩ, multi-turn trimmer

Pot = 50 kΩ, potentiometer, linear, 10 turns

 

Capacitors

C1 = 10 μF, 25V, tantalum
C2 = 100 nF, ceramic
C3 = 10 nF, ceramic
 

Semiconductors

U1 = MCP6002, op-amp

U2 = LM236H-2.5, 2.49 V voltage reference

D1 = 1N5819, schottky diode

D2, D3 = 1N4148, diode

 

Miscellaneous

SW1 = switch, SP

B1...B4 = 4 x AA, 1.5 V alkaline cells with battery holder 

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