ESP32_LM75A README

Description:

This is a LM75A temperature sensor device driver for ESP32(ESP32-DevKitC).

Setup HW environment

connect ESP32 and LM75A like this:

LM75A sensor	Despriction	ESP32 (demo)
VCC	Power PIN	GPIO2
GND	GND	GND
SDA	A4 (I2C SDA)	GPIO 18
SCL	A5 (I2C SCL)	GPIO 19
A0	GND (or VCC to increase I2C address of 1)	None
A1	GND (or VCC to increase I2C address of 2)	None
A2	GND (or VCC to increase I2C address of 4)	None
OS	Interrupt PIN	GPIO4

Setup SW environment

1. Clone esp-idf and setup it as guide.
2. Clone esp32_lm75a
3. cd esp32_lm75a
4. make menuconfig
5. make && make flash

Use the esp32_lm75a demo

esp32> lm75a init
I (36803) gpio: GPIO[2]| InputEn: 0| OutputEn: 1| OpenDrain: 0| Pullup: 0| Pulldown: 0| Intr:0
I (36803) gpio: GPIO[4]| InputEn: 1| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:2
esp32> lm75a temp
lm75a_read_temperature=26.5
esp32> lm75a set_tos 30
lm75a_set_tos: 30
esp32> lm75a set_thys 29
lm75a_set_thys: 29
esp32> lm75a set_int 1
lm75a_set_int: 1
init_os_gpio!
(make temperature high enough to 30)
esp32> GPIO[4] intr, val: 0(interrupt happened)

(make temperature go down below 29)
esp32> GPIO[4] intr, val: 0 (interrupt happened)

esp32> lm75a set_int 0
lm75a_set_int: 0
deinit_os_gpio!
quit gpio_int_task
esp32> lm75a deinit
deinit_os_gpio!