espthp

A sketch for ESP8266 ESP-01 It enables the ESP8266 to connect to WiFi and send data from BME/BMP280 to an MQTT server.

connections

Reset pin is high (with 10-12k resistor) and pulled low for reset. ESP.GPIO0 is pulled low for programming.

After uploading the sketch: ESP.GPIO0 is connected to BME280.SDA ESP.GPIO2 is connected to BME280.SCL

pre-upload

create a file called config.h containing:

#define WIFI_SSID "<wifi-name>"
#define WIFI_PASS "<wifi-password>""
#define MQTT_IP "192.168.0.107"
#define MQTT_PORT 1883

MQTT channels

The following channels are used.

raw/chipId/status
raw/chipId/temperature
raw/chipId/humidity
raw/chipId/pressure
raw/chipId/vcc

All data is sent to a raw tree using the chipId of ESP. The status is retained, set to online when ESP connects and set by mqtt broker to 'disconnected' when no response from ESP was had for some period of time.

Picture

Test setup after uploading (without serial connection).