AA AAA Battery tester, Arduino Nano, OLED

Description

You can test the voltage of AA and AAA batteries with this thing. 9V battery as power source. Quite a bit of tinkering is required... Requires: * Arduino Nano * 0,96" OLED display * 9V battery * wires * metal clips * hot glue * small power switch Be aware, different manufacturers of the Arduino have slightly different measurements. Measure before printing... * Save code to Nano * Glue some kind of metal clips for the test batteries in place * Glue OLED Screen in place * Connect 9V battery (-) to power switch * Connect 9V battery (+) to Nano VIN * Connect AA battery (-) to AAA battery (-) * Connect Nano A0 to Nano D2 to AA/AAA Batteries (+). * Connect Nano GND to OLED GND to power switch to AA/AAA Batteries (-) * Connect OLED VCC to Nano 5V * Connect OLED SDA to Nano A4 * Connect OLED SCL to Nano A5 * Put printed reset button below the Nano * Put/Glue Nano in place * Glue power switch somewhere and cut out a piece of the case It's a pretty tight fit. Upscale everything on Z axis if needed. You could connect AREF to 3.3V for even more precise results (code change required). Code (replace brackets in first two lines): <pre> #include (bracket open)U8g2lib.h(bracket close) #include (bracket open)Wire.h(bracket close) U8G2_SSD1306_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0, U8X8_PIN_NONE); int sensorPin = A0; int sensorValue = 0; float voltage = 0; void setup() { u8g2.begin(); u8g2_prepare(); pinMode(2, OUTPUT); digitalWrite(2, LOW); } void loop() { sensorValue = analogRead(sensorPin); voltage = (float) 5 / 1023 * sensorValue; String voltageStr = String(voltage); u8g2.clearBuffer(); u8g2_prepare(); u8g2.drawStr(18, 10, voltageStr.c_str()); u8g2.sendBuffer(); delay(500); } void u8g2_prepare() { u8g2.setFont(u8g2_font_logisoso38_tn); u8g2.setFontRefHeightExtendedText(); u8g2.setDrawColor(1); u8g2.setFontPosTop(); u8g2.setFontDirection(0); }</pre>

Statistics

Category

Tags