This is a major upgrade to my Battery-Powered Wifi Temp/humidity Sensor found HERE.

The layout has changed but it is compatible with your existing sketches.

Design Updates:

• Uses SMD components where possible for ease of fabrication and repair
• Added Reverse-battery protection diodes
• Added battery protection diode
• Added battery power switch
• Added fuse protection to 5v(750ma) and 3.3v(500ma) power rails
• Added dedicated SPI expansion port - WITH MicroSD CARD OPTION!
• Added dedicated I2C expansion port for using I2C sensors or controllers
• Moved program/debug headers to edge of board
• Re-arranged components for ease of use
• Removed 5V LDO option to simplify use
• Replaced 3-pin LED with dedicated SMD RED and GREEN LEDs

This Arduino-compatible, battery-powered, Wifi-enabled DHT-22 sensor board allows you to easily deploy a remote Temperature and Humidity sensor along with additional sensors of your choice.

You can now OPTIONALLY replace the DHT-22 sensor with an HC-SR04 Ultrasonic Range sensor. A male header will be installed in Sensor port 1 in-place of the DHT-22 and a 12-inch, 4-pin cable is provided.

Upload data to a free ThingSpeek.com channel, send it to your ConnectedHome central monitoring station, log it locally with the NEW OPTIONAL MicroSD card module, or send it to any other location you desire - it is completely up to you!

Using 2 18650 3.7v batteries in parallel (batteries not included), this SMART sensor board can be deployed ANYWHERE. As long as it can connect to Wifi, it can upload temp/humidity data.

NOTE: This Sensor Board comes fully assembled but the 18650 battery holder has not been attached. This is to allow you to add additional sensors if desired. You will need to mount your own additional sensors (optional), and solder the battery holder onto the board. You can optionally elect to have the battery holder mounted and female pin headers installed in Sensor2 and Sensor3 prior to shipping.

There are 2 additional 3-pin sensor ports to allow you to connect additional sensors if you desire. Sensor2 and Sensor3 use Arduino pins D10 and A1.

There is a dedicated I2C port, so you can connect I2C sensors or control I2C devices.

There is a dedicated SPI port, which is PIN-COMPATIBLE with the MicroSD card module I sell in my store. This allows you to log data locally in areas where you don't have a Wifi connection.

On-board DHT-22 sensor measures temperature and humidity with 0.5%C temperature accuracy and 2% humidity accuracy. Fully supported by easy-to-use Arduino library, on Arduino pin D16/A2.

On-board 3.3v Boost regulator provides 800ma and can be shutdown from within your Arduino sketch (pin D3) for Ultra-low power consumption.

Battery voltage is connected to Arduino pin A0 through a voltage divider, allowing you to monitor battery voltage.

By adding your own additional sensors, deployment options are limitless.

FEATURES

100% ARDUINO IDE compatible. Compatible with all Arduino libraries.

Supports up to 3 on-board sensors simultaneously (DHT-22 takes up one port) + I2C and SPI sensors

Pull-up resistor can be installed for Sensor2 and Sensor3 (through-hole resistors not included)

Supports WiFi communications with INCLUDED ESP8266 modules (ESP-01)

Atmega328-based; fully supported in Arduino IDE for ease of programming (board type UNO/Genuino), 28-PIN DIP IC for easy removal or replacement

Arduino UNO/Genuino bootloader pre-loaded

Flexible power options; can use 2 18650 batteries (parallel only) via the on-board battery holder, or can be power from the 2-pin Molex connector (2.5 to 5Vdc DO NOT EXCEED 5Vdc)

Dedicated Arduino pin for monitoring and reporting battery voltage (A0)

On-board red/green LED allows for status signaling

Configurable for ULTRA LOW POWER; can run several months on 2 18650 batteries when properly configured

5-pin Program/Debug port for easy sketch/HEX upload via USB-Serial adapter (optional)

6-pin ICSP connector for uploading Ardunio bootloader or sketches/HEX directly via AVRISP programmer (optional)

3-pin Progam/Debug port for ESP-8266; allows for firmware updates

RESET button

Flash button for ESP-8266, with slide switch to enable DEBUG mode

DETAILS

Sensors

• 3 dedicated sensor ports allow for multiple sensor options (additional sensors not included)
• Sensor2 and Sensor3 ports can be configured with pull-up resistor (resistors not included)
• Dedicated I2C and SPI ports
• Supports 3.3v and 5v sensors (if powered from 5V source) - VCC voltage configurable via jumper
• Dedicated port for ESP8266 Wifi Module

Power

• Supply voltage 2.5-5vdc (3vdc required to start up, then will run down to 2.5vdc)
• VCC can be set to 5v or 3.3v, via VCC_SRC jumper
• On-board 3.3v BOOST converter supplies 800ma and can be disabled by Arduino sketch for maximum power savings (Atmega328 must be configured to run from VIN battery voltage or 5V power source in order to shutdown the 3.3v reg and ESP8266)
• Dual-18650 battery holder 2 x 18650 can be mounted to bottom of board, creating a mobile sensor unit for quick or temporary deployments. Can be only be used in PARALLEL battery configuration
• 2-pin, 2.54mm MOLEX connector, supply 2-5-5vdc. Can use 3 AA batteries in SERIES
• 3-pin PWR header for sourcing or applying 5V, 3v3, and GND
• Monitor/report battery voltage by reading Arduino pin A0. Uses INTERNAL 1.1 voltage reference

Communications

• Supports Wifi communications with INCLUDED ESP8266 module (not pictured)
• 5-Pin Dedicated Program/Debug interface can use a standard USB-Serial adapter to program/debug the board (Arduino IDE Compatible)
• 6-pin ICSP Header can use an AVRISP programmer to load the Arduino bootloader or upload HEX files 6-PIN AvrISP or 10-PIN AvrISP (both Arduino IDE Compatible)

See the product page for the various serial programmers I sell for instructions on installing the driver and communicating with the board:

6-PIN AVRISP Programmer

10-Pin AVRISP Programmer

USB-Serial Converter

See my GitHub site for example Arduin-compatible sketches (Atrduino IDE required)

BurgessWorld GitHub

Dimensions

• 42.5mm x 78mm outline
• mounting hole spacing 34mm x 69.5mm - can't be used when battery holder is mounted to board