Chip-based microcontroller ESP8266
offers a complete wireless networking solution
in a compact module design ESP-01
cooperating with various digital sensors
sensors DHT11/DHT22 designated
for temperature/humidity measurement
powered via photovoltaic panel.
HuTemp is a wireless temperature and humidity sensor based on ESP8266 microcontrollers.
ESP8266 ESP-01 WiFi module:
- Integrated 32-bit RISC procesor
- wireless standards 802.11 b/g/n (11-150Mbps)
- encryption and security WEP/WPA/WPA2 & TKIP/AES
- integrated TCP/IP stack
- QOS management & I2S interface
The HuTemp v4 version is powered via a photovoltaic panel with an integrated backup source.
Wireless temperature and humidity sensor:
- procesor 80-160MHz (Xtensa LX106)
- storage 1MB QSPI
- integrated MQTT publisher
- powered by PVP 5-30V DC
- integrated UPS 3,7V/2200mA
- power consumption 0,1W
- size 80 x 110 x 40mm
It is a light, compact, open data exchange protocol designed for data transmission to remote locations,
where a small code size is required and there are bandwidth limitations, it consists of three modules:
MQTT Publisher
publishes messages to the MQTT intermediary (broker),
thus, it acts as an MQTT client, writing each entry as a separate message.
MQTT Broker
An intermediary is an entity that enables clients to communicate.
MQTT (broker) receives messages published by MQTT clients (publisher),
which it then filters and distributes to MQTT subscribers.
MQTT Subscriber
The subscriber signs up to receive messages from the MQTT broker (broker),
to be able to subscribe (receive) messages. It actually works as a client that generates a record for each message.
Technical parameters of usable sensors
HuTemp [DHT11]
- working voltage: 3–3.6V DC
- temperature range: 0 - +50°C
- temperature accuracy: ± 2°C
- humidity range: 20-90%
- humidity accuracy: ± 5%
HuTemp [DHT22]
- working voltage: 3.3-6V DC
- temperature range: -40 - +80°C
- temperature accuracy: ± 0.5°C
- humidity range: 0-100%
- humidity accuracy: ± 2%