/*
Example animated analogue meters
Needs Font 2 (also Font 4 if using large scale label)
Make sure all the display driver and pin connections are correct by
editing the User_Setup.h file in the TFT_eSPI library folder.
#########################################################################
###### DON'T FORGET TO UPDATE THE User_Setup.h FILE IN THE LIBRARY ######
#########################################################################
Requires widget library here:
https://github.com/Bodmer/TFT_eWidget
*/
#include <TFT_eSPI.h> // Hardware-specific library
#include <TFT_eWidget.h> // Widget library
TFT_eSPI tft = TFT_eSPI(); // Invoke custom library
MeterWidget amps = MeterWidget(&tft);
MeterWidget volts = MeterWidget(&tft);
MeterWidget ohms = MeterWidget(&tft);
#define LOOP_PERIOD 15 // Display updates every 35 ms
void setup(void)
{
tft.init();
tft.setRotation(0);
Serial.begin(115200); // For debug
// Colour zones are set as a start and end percentage of full scale (0-100)
// If start and end of a colour zone are the same then that colour is not used
// --Red-- -Org- -Yell- -Grn-
amps.setZones(75, 100, 50, 75, 25, 50, 0, 25); // Example here red starts at 75% and ends at 100% of full scale
// Meter is 239 pixels wide and 126 pixels high
amps.analogMeter(0, 0, 2.0, "mA", "0", "0.5", "1.0", "1.5", "2.0"); // Draw analogue meter at 0, 0
// Colour draw order is red, orange, yellow, green. So red can be full scale with green drawn
// last on top to indicate a "safe" zone.
// -Red- -Org- -Yell- -Grn-
volts.setZones(0, 100, 25, 75, 0, 0, 40, 60);
volts.analogMeter(0, 128, 10.0, "V", "0", "2.5", "5", "7.5", "10"); // Draw analogue meter at 0, 128
// No coloured zones if not defined
ohms.analogMeter(0, 256, 100, "R", "0", "", "50", "", "100"); // Draw analogue meter at 0, 128
}
void loop()
{
static int d = 0;
static uint32_t updateTime = 0;
if (millis() - updateTime >= LOOP_PERIOD)
{
updateTime = millis();
d += 4; if (d > 360) d = 0;
// Create a Sine wave for testing, value is in range 0 - 100
float value = 50.0 + 50.0 * sin((d + 0) * 0.0174532925);
float current;
current = mapValue(value, (float)0.0, (float)100.0, (float)0.0, (float)2.0);
//Serial.print("I = "); Serial.print(current);
amps.updateNeedle(current, 0);
float voltage;
voltage = mapValue(value, (float)0.0, (float)100.0, (float)0.0, (float)10.0);
//Serial.print(", V = "); Serial.println(voltage);
volts.updateNeedle(voltage, 0);
float resistance;
resistance = mapValue(value, (float)0.0, (float)100.0, (float)0.0, (float)100.0);
//Serial.print(", R = "); Serial.println(resistance);
ohms.updateNeedle(resistance, 0);
}
}
float mapValue(float ip, float ipmin, float ipmax, float tomin, float tomax)
{
return tomin + (((tomax - tomin) * (ip - ipmin))/ (ipmax - ipmin));
}