Project based on Grove Thermocouple and 7 segment LED display driven by pcf8573 This was an undocumented low cost unit I purchased on the street in Thailand.
https://www.ti.com/lit/ds/symlink/pcf8574.pdf
** The Display **
Showing number 0-9 on a Common Anode 7-segment LED display through i2c using pcf8574
The display has 4 positions where only three are used, each position is addressed seperatetely.
PCF8574 PCF_24(0x24); // dp - add leds to lines (used as output) PCF8574 PCF_34(0x34); // unused position - add leds to lines (used as output) PCF8574 PCF_35(0x35); // position c - add leds to lines (used as output) PCF8574 PCF_36(0x36); // position b - add leds to lines (used as output) PCF8574 PCF_37(0x37); // position a - add leds to lines (used as output)
Displays the numbers 0-9 on the display, with one second inbetween.
value to display number on 7 segment led display
0 => 63 1 => 1 2 => 91 3 => 79 4 => 102 5 => 109 6 => 125 7 => 7 8 => 127 9 => 111
Display address 0x34 to 0x37 (for the numbers) address 0x24 for dp
Library used #include "PCF8574.h"
** The Thermocouple **
Thermocouple used from SEEED (Grove) using analog inputs
// Thmc -> A5 // RoomTemp -> A4
#include "High_Temp.h" https://github.com/Seeed-Studio/Grove_HighTemp_Sensor https://github.com/Seeed-Studio/Grove_HighTemp_Sensor/blob/master/High_Temp.h