Add basic hardware simulation

firmware/main/hardware.cpp

@@ -0,0 +1,57 @@
+// Library for managing hardware
+
+#include <Arduino.h>
+#include "hardware.h"
+
+bool simulating = false;
+float simulatedPressure = 0.0;
+float inflatePSIPerSecond = 0.0;
+float deflatePSIPerSecond = 0.0;
+float pressureChangeRate = 0.0;
+float deflateOffsetMultiplier = 0.0;
+float inflateOffsetMultiplier = 0.0;
+float offsetMultiplier = 0.0;
+
+void initSimulation() {
+	simulating = true;
+	simulatedPressure = (float) random(10, 30);
+	inflatePSIPerSecond = random(8, 12) / 100.0;
+	deflatePSIPerSecond = random(35, 45) / 100.0;
+	deflateOffsetMultiplier = random(3, 10) / 100.0;
+	inflateOffsetMultiplier = 1.0 - deflateOffsetMultiplier;
+	offsetMultiplier = 1.0;
+}
+
+void tickSimulation() {
+	static unsigned long lastTick = millis();
+
+	float pressureDelta = (millis() - lastTick) / 1000.0 * pressureChangeRate;
+
+	simulatedPressure += pressureDelta;
+	lastTick = millis();
+}
+
+void measurePressure(float &pressureValue, int pin) {
+	if (simulating) {
+		float adjusted = simulatedPressure + (random(-100, 100) / 100.0);
+		adjusted *= offsetMultiplier;
+		pressureValue = 0.99 * pressureValue + 0.01 * adjusted;
+	} else {
+		int sensorValue = analogRead(pin);
+		float adjusted = 0.098 * sensorValue - 16.56 + 3.58;
+		pressureValue = 0.99 * pressureValue + 0.01 * adjusted;
+	}
+}
+
+void setSoleniod(int solenoidState) {
+	if (solenoidState == SOLENOID_STOP) {
+		pressureChangeRate = 0.0;
+		offsetMultiplier = 1.0;
+	} else if (solenoidState == SOLENOID_INFLATE) {
+		pressureChangeRate = inflatePSIPerSecond;
+		offsetMultiplier = inflateOffsetMultiplier;
+	} else if (solenoidState == SOLENOID_DEFLATE) {
+		pressureChangeRate = -deflatePSIPerSecond;
+		offsetMultiplier = deflatePSIPerSecond;
+	}
+}

firmware/main/hardware.h

@@ -0,0 +1,15 @@
+// Library for managing hardware
+
+#ifndef _hardware_H_
+#define _hardware_H_
+
+#define SOLENOID_STOP 0
+#define SOLENOID_INFLATE 1
+#define SOLENOID_DEFLATE 2
+
+void initSimulation();
+void tickSimulation();
+void measurePressure(float &pressureValue, int pin);
+void setSoleniod(int solenoidState);
+
+#endif

firmware/main/main.ino

@@ -3,7 +3,9 @@
 #include <Adafruit_SSD1306.h>
 #include <Adafruit_FeatherOLED.h>
 
+#include "hardware.h"
 
+#define SIMULATE 1
 #define DEBUG 0
 
 #define TIMEOUT_TIME 7000
@@ -58,6 +60,8 @@ int pressureSetPoint = 69;
 
 void setup()
 {
+	randomSeed(analogRead(A1));
+
 	Serial.begin(115200);
 
 	oled.init();
@@ -65,18 +69,20 @@ void setup()
 	pinMode(UP_BUTTON, INPUT_PULLUP);
 	pinMode(ENTER_BUTTON, INPUT); // Has external pullup
 	pinMode(DOWN_BUTTON, INPUT_PULLUP);
+
+#ifdef SIMULATE
+	initSimulation();
+#endif
 }
 
 void loop() {
-	measurePressure();
+	measurePressure(pressureValue, PRESSURE_SENSOR_PIN);
 	pollButtons();
 	runUI();
-}
 
-void measurePressure() {
-	int sensorValue = analogRead(PRESSURE_SENSOR_PIN);
-	float adjusted = 0.098 * sensorValue - 16.56 + 3.58;
-	pressureValue = 0.99 * pressureValue + 0.01 * adjusted;
+#ifdef SIMULATE
+	tickSimulation();
+#endif
 }
 
 void runUI() {
@@ -114,7 +120,7 @@ void runUI() {
 				nextState = PRESSURE;
 				timer = millis();
 			} else if (enterButton == HELD) {
-				;
+				setSoleniod(SOLENOID_DEFLATE);
 			} else if (upButton == PRESSED) {
 				screenState = SET_POINT;
 				pressureSetPoint = (int) pressureValue;