Ian Wolf
MBED Application board used to control frequency and duty cycle of injector valves
Revision 0:9b2c760c8e5c, committed 2017-07-25
- Comitter:
- iwolf32
- Date:
- Tue Jul 25 14:29:20 2017 +0000
- Commit message:
- REV1
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/coil-driver.cpp Tue Jul 25 14:29:20 2017 +0000
@@ -0,0 +1,49 @@
+// Begin sample code
+/*
+#include "mbed.h"
+#include "rtos.h"
+#include "coil-driver.h"
+// Coil parameters [control pin, spike time (us), hold time period (us), hold time pulse width (us)]
+Coil orange(A0, 500, 40, 3); // Valve driven by pin A0, 500us spike time, 25kHz PWM at 7.5% duty cycle
+
+Coil yellow(A1, 5000, 40, 6); // Valve driven by pin A1, 5ms spike time, 25kHz PWM at 15% duty cycle
+
+int main()
+{
+ while (true) {
+ orange.on();
+ yellow.on();
+ Thread::wait(500);
+ orange.off();
+ yellow.off();
+ Thread::wait(500);
+ }
+}
+*/
+// End sample code
+
+#include "coil-driver.h"
+
+// Default constructor
+Coil::Coil(PinName _controlPin, uint16_t _spikeus, uint16_t _holdperiod_us, uint16_t _holdpulse_us)
+ : controlOut(_controlPin),
+ spikeus(_spikeus),
+ holdperiod_us(_holdperiod_us),
+ holdpulse_us(_holdpulse_us)
+{
+ controlOut.write(0.0); // Ensure coil output is off by default
+ controlOut.period_us(holdperiod_us); // PWM control period (uint16_t microseconds)
+
+};
+
+void Coil::on()
+{
+ controlOut.write(1.0);
+ wait_us(spikeus);
+ controlOut.pulsewidth_us(holdpulse_us);
+}
+
+void Coil::off()
+{
+ controlOut.write(0.0);
+}
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/coil-driver.h Tue Jul 25 14:29:20 2017 +0000
@@ -0,0 +1,22 @@
+#ifndef COIL_DRIVER_H
+#define COIL_DRIVER_H
+
+#include "mbed.h"
+#include "rtos.h"
+
+// Coil driver class. Applies full power for given "spike" time
+// and then applies a PWM signal to keep the coil energized at a lower power.
+class Coil
+{
+public:
+ Coil(PinName _controlPin, uint16_t _spikeus, uint16_t _holdperiod_us, uint16_t _holdpulse_us);
+
+ //InterruptIn controlIn; // Input for external coil "ON" signal
+ PwmOut controlOut; // PWM output pin driving coil
+ uint16_t spikeus, holdperiod_us, holdpulse_us, pwmFrequency;
+
+ void on();
+ void off();
+};
+
+#endif
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Tue Jul 25 14:29:20 2017 +0000
@@ -0,0 +1,58 @@
+#include "mbed.h"
+#include "rtos.h"
+#include "coil-driver.h"
+
+Coil yellow(A0, 300, 40, 4); // Injector
+InterruptIn dutycycleup(A2);
+InterruptIn dutycycledown(D4);
+InterruptIn frequencyup(A5);
+InterruptIn frequencydown(A4);
+
+Serial pc(USBTX, USBRX);
+
+double frequency=5;
+double dutycycle=0.75;
+float openvalue=(((1/frequency)*dutycycle));
+float offvalue=(1/frequency)-openvalue;
+
+void dutycycleincrease()
+{
+ dutycycle=dutycycle+0.01;
+}
+
+void dutycycledecrease()
+{
+ dutycycle=dutycycle-0.01;
+}
+
+void frequencyincrease()
+{
+ frequency=frequency+1;
+}
+void frequencydecrease()
+{
+ frequency=frequency-1;
+}
+
+int main() {
+
+dutycycleup.rise(&dutycycleincrease);
+dutycycledown.rise(&dutycycledecrease);
+frequencyup.rise(&frequencyincrease);
+frequencydown.rise(&frequencydecrease);
+
+while(1){
+
+float openvalue=(((1/frequency)*dutycycle));
+float offvalue=(1/frequency)-openvalue;
+
+yellow.on();
+wait(openvalue);
+yellow.off();
+wait(offvalue);
+
+pc.printf("Frequency: %f\r\n", frequency);
+pc.printf("\n");
+pc.printf("Duty Cycle: %f\r\n", dutycycle);
+}
+}
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed-rtos.lib Tue Jul 25 14:29:20 2017 +0000 @@ -0,0 +1,1 @@ +https://mbed.org/users/mbed_official/code/mbed-rtos/#5713cbbdb706
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Tue Jul 25 14:29:20 2017 +0000 @@ -0,0 +1,1 @@ +https://mbed.org/users/mbed_official/code/mbed/builds/a97add6d7e64 \ No newline at end of file