Kelder/obus
33
0
Fork 0
Code Issues 3 Pull requests Projects Releases Packages Wiki Activity

Reverse engineered and wired up R455 timer

Browse source
This commit is contained in:
redfast00 2022-02-01 12:56:09 +01:00
parent 04ceee27d1
commit 438213ea59
No known key found for this signature in database
GPG key ID: 5946E0E34FD0553C
1 changed files with 86 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

86
misc/reverse_engineered_hardware/r455_timer/r455_timer.ino Normal file
View file

@ -0,0 +1,86 @@
#include "PCF8575.h"
#define RESET_BUTTON_PIN A3
#define START_BUTTON_PIN A0
#define STOP_BUTTON_PIN A2
#define MODE_SWITCH A1
// These are IO expanders, connected to the LED display
PCF8575 pcf_0(0x20);
PCF8575 pcf_1(0x22);
// Goes from 0-9, then a blocky 8, -, then blank
uint8_t display_value[7] = {11, 11, 11, 11, 11, 11, 11};
// Arduino pins the dials are connected to
uint8_t dial_pins[6] = {2, 3, 5, 6, 9, 10};
// Values for analogRead() for the dials. Maps dial position to expected value.
int16_t dial_analog_values[10] = {6, 85, 160, 214, 280, 314, 353, 382, 410, 430};
// warning, the "5"-position is broken on two of the dials and sometimes only retuns some of the bits it's composed of
uint8_t dial_readout[6] = {0};
void setup()
{
Serial.begin(115200);
pcf_0.begin();
pcf_1.begin();
Serial.print("Connected? : ");
Serial.println(pcf_0.isConnected());
Serial.println(pcf_1.isConnected());
delay(1000);
for (int i = 0; i < 6; i++) {
pinMode(dial_pins[i], OUTPUT);
digitalWrite(dial_pins[i], LOW);
}
pinMode(RESET_BUTTON_PIN, INPUT_PULLUP);
pinMode(STOP_BUTTON_PIN, INPUT_PULLUP);
pinMode(START_BUTTON_PIN, INPUT_PULLUP);
pinMode(MODE_SWITCH, INPUT_PULLUP);
}
void updateDisplay() {
uint8_t shift_to_pin[4] = {2, 0, 1, 3};
for (uint8_t display = 0; display < 7; display++) {
for (uint8_t shift = 0; shift < 4; shift++) {
uint8_t pin = shift_to_pin[shift];
if (display >= 4) {
pcf_1.write((display - 4) * 4 + pin, 0 < (display_value[display] & (1 << shift)));
} else {
pcf_0.write(display * 4 + pin, 0 < (display_value[display] & (1 << shift)));
}
}
}
}
void readDial() {
// Reads all dials by turning on dial pins one by one, then measuring the
// voltage in the resistor network
for (int dial = 0; dial < 6; dial++) {
digitalWrite(dial_pins[dial], HIGH);
delay(1);
int16_t measured = analogRead(A7);
digitalWrite(dial_pins[dial], LOW);
int16_t minimal_difference = 1024;
uint8_t best_candidate = 0;
for (uint8_t i = 0; i < 10; i++) {
int16_t difference = abs(measured - dial_analog_values[i]);
if (difference < minimal_difference) {
minimal_difference = difference;
best_candidate = i;
}
}
dial_readout[dial] = best_candidate;
}
}
void loop()
{
readDial();
for (int i = 0; i < 6; i++) {
display_value[6 - i] = dial_readout[i];
}
updateDisplay();
}