OEM Oil Pressure And Temperature Gauge Arduino Manufacturers & Factory

ABOUT US: Engineering Excellence & OEM Reach

Huzhou Accuracy Instrument CO LTD is professionally engaged in the development, sales and service of industrial mechanical pressure gauges, bi-metal thermometers, SF6 manometer, and pressure sensors. Products are widely used in various applications such as Mechanical Engineering, Chemical Engineering, Food Industry, Pharmaceutical, and high technology electric appliances.

Established over two decades ago, our pressure gauge manufacturing facility spans 3,000 square meters, equipped with advanced production lines and rigorous quality control systems. As an industry leader, we integrate innovation with precision engineering to deliver reliable measurement solutions for global clients.

#define PRESSURE_PIN A0
#define TEMP_PIN A1

// Calibration Parameters
const float VCC = 5.0;            // Regulated supply
const float P_MIN_V = 0.5;        // 0 PSI voltage
const float P_MAX_V = 4.5;        // 150 PSI voltage
const float MAX_PSI = 150.0;

void setup() {
  Serial.begin(115200);
  pinMode(PRESSURE_PIN, INPUT);
  pinMode(TEMP_PIN, INPUT);
}

void loop() {
  // 1. Read Pressure Transducer
  int rawP = analogRead(PRESSURE_PIN);
  float vP = (rawP / 1023.0) * VCC;
  float psi = ((vP - P_MIN_V) / (P_MAX_V - P_MIN_V)) * MAX_PSI;
  if (psi < 0) psi = 0.0;

  // 2. Read NTC Thermistor via Steinhart-Hart Equation
  int rawT = analogRead(TEMP_PIN);
  float rT = 10000.0 * (1023.0 / (float)rawT - 1.0);
  float logRT = log(rT);
  float tempK = 1.0 / (0.001129141 + (0.000234125 * logRT) + (0.0000000876741 * logRT * logRT * logRT));
  float tempC = tempK - 273.15;

  Serial.print("Oil Pressure (PSI): "); Serial.print(psi);
  Serial.print(" | Oil Temp (°C): "); Serial.println(tempC);
  delay(500);
}
          

Circuit Optimization & Hardware Design Notes

• Analog Filtering: Place a 0.1µF ceramic capacitor across the signal output and GND pins near the Arduino board to suppress high-frequency ignition noise and alternator ripple.
• RC Low-Pass Filter: Implement a passive RC low-pass filter (1kΩ resistor, 10µF capacitor) to stabilize pressure signal readings in high-vibration applications.
• Precision Voltage Reference: For high-accuracy applications, avoid using noisy USB power. Utilize an external 5V precision reference IC (such as LM4040) or use the AREF pin on Arduino for 0.5% full-scale accuracy.
• Steinhart-Hart Coefficients: Our factory provides calibrated A, B, and C Steinhart-Hart thermistor coefficients customized for each production lot of oil temperature sensors to ensure seamless microcontroller software integration.