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STD Voltampermeter
Profile：Simple voltamperemeter
Description
Simple AVR voltamperemeter, based on INA219, ATmega8, 2481AS 7-segments displays.
Allows you to measure voltage in the range of 0-26V in 0.01V steps, current in the range of 0-3A with a step of 1 mA.
Embdeded calibration with two buttons, recovered in EEPROM.
Configurable dynamic display period and refresh rate.
Design Drawing
schematic diagram
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PCB
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| ID | Name | Designator | Footprint | Quantity |
|---|---|---|---|---|
| 1 | 100nF | C1,C2,C4 | 0805 | 3 |
| 2 | 10uF | C9 | C1206 | 1 |
| 3 | 2481AS | CUR,VOLT | 2481AS | 2 |
| 4 | 1206 | L2 | INDUCTOR-1206 | 1 |
| 5 | 1206 0R1 | R1 | R2512 | 1 |
| 6 | 220 | R2,R3,R4,R5,R6,R7,R8,R9 | R0805 | 8 |
| 7 | 10k | R10,R11,R12 | R0805 | 3 |
| 8 | 3*4*2mm SMD | RESET1,RESET2 | 3*4*2MM | 2 |
| 9 | ATMega8 | U3 | TQFP-32_L7.0-W7.0-P0.80-LS9.0-BL | 1 |
| 10 | INA219BIDCNR | U5 | SOT-23-8_L3.0-W1.7-P0.65-LS2.8-BR | 1 |
| 11 | 78L05 | U6 | SOT-89-3_L4.5-W2.5-P1.50-LS4.2-BR | 1 |
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