> For the complete documentation index, see [llms.txt](https://learn.pakronics.com.au/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://learn.pakronics.com.au/seed-studio/grove-modules/others/grove-node.md).

# Grove Node

Grove - Node is a simple and flexible electronic module to connect physical objects. It's based on the idea of IFTTT (IF-This-Then-That). It has two Grove connectors to access a variety of [Grove](https://app.gitbook.com/Grove) modules. With pre-programming IFTTT firmware, it's easy to create physical objects with analog sensors and 0/1 actuators.

It integrates Bluetooth Low Energy (BLE) which makes it extremely easy to interact with phones and tablets. To extend its usability, a DFU bootloader is built in to reprogram it Over-The-Air through BLE. It supports ARM mbed platform to write new firmware with hundreds of libraries.

## Features

* IFTTT pattern to use
* Two Grove connectors for sensors and actuators
  * Plug-Play with analog sensors and high/low actuators
    * Flexible 4 GPIOs, all can be used for PWM, ADC, I2C and UART
* Nordic nRF51822 Multi-protocol Bluetooth® 4.0 low energy/2.4GHz RF SoC
  * ARM Cortex-M0 processor
    * 256kB flash, 16kB RAM
* On board battery charge circuit
* OTA firmware
* mbed enabled
  * Online IDE
    * Easy to use C/C++ SDK
    * Handy libraries

## Specifications

* Operating voltage: 3.3Vdc
* Battery capacity: 80mAH
* Maximum charge current: 100mA
* Grove Interface supply Voltage：3.3V
* Grove Interface supply Current: 100mA max
* Grove Interface input Voltage：0\~3.3V

## Pinout

## Get Started

* Turn On Grove Node

Connect Grove Node with a battery or a USB cable and then press its button, it will run.

 \* Double Clicks - run its bootloader, the red LED will be on. \* Otherwise - run its application, the green LED will blink.

* Turn Off Grove Node
* In bootloader mode - wait for a while to run into the application.
* In application mode - long press the button wait until all LEDs are off \</dd>\</dl>

### Get Started with Pre-programmed Firmware

![](https://github.com/SeeedDocument/Grove-Node/raw/master/img/Milcandy_IFTTT.jpg)

First, we need an **Input** Grove module to sense the physical world. Pre-programmed firmware only supports an analog input sensor or 0/1 digital input sensor. The following Grove modules from Seeedstudio can be used as an **Input**:

| Module name                            | Parameter to measure |
| -------------------------------------- | -------------------- |
| Grove - 80cm Infrared Proximity Sensor | Distance             |
| Grove - Button                         | On/Off               |
| Grove - Electricity Sensor             | Electricity          |
| Grove - Gas Sensor(MQ2\&MQ5)           | Gas Quality          |
| Grove - Light Sensor                   | Light                |
| Grove - Magnetic Switch                | Magnetic             |
| Grove - Moisture Sensor                | Moisture             |
| Grove - PIR Motion Sensor              | PIR Motion           |
| Grove - Rotary Angle Sensor            | Rotary Angle         |
| Grove - Tilt Switch                    | Object Position      |
| Grove - Sound Sensor                   | Sound                |
| Grove - Temperature Sensor             | Temperature          |
| Grove - Touch Sensor                   | Human touch          |
| Grove - Water Sensor                   | Water                |

Other analog sensors which is not Grove-compatible need a little small adjustment. Just connect your signal output to pin4 of Grove connector and then the VCC and GND. *Note that only sensors that output an analog or digital 1/0 value can be used with the pre-programmed firmware*

![](https://github.com/SeeedDocument/Grove-Node/raw/master/img/Mil_Grove_con.png)

Second, we need an **output** Grove module as an actuator. The following Grove modules can be used:

| Module name      | Action when triggered       |
| ---------------- | --------------------------- |
| Grove - Buzzer   | Buzzer enabled              |
| Grove - LED      | LED On                      |
| Grove - Vibrator | Vibrate                     |
| Grove - Relay    | Swith On/Off other circuits |

For example, we intend to create a light which automatically turns on if the environment is dark and turns off if otherwise, then we select a [Grove\_-\_Light\_Sensor](https://app.gitbook.com/Grove-Light_Sensor) and a [Grove\_-\_LED](https://app.gitbook.com/Grove-LED).

Third, teach the Grove Node a logic.

Connect the light sensor as an input and the LED as an output, and then turn on the Grove Node.

* In a normal environment, do a single-click on the Grove Node's button
* Cover the light sensor with a hand to simulate a dark environment, and then do a double-clicks, the Grove - LED will be on.
* Release the light sensor, the Grove - LED will be off.

## Over-The-Air

The Grove Node has a pre-programmed OTA bootloader. To run into the bootloader:

1. power off the Grove Node
2. do a double-clicks on the Grove Node's button
3. the red LED will be on and a BLE device named SD7DFU can be scaned
4. use [nRF Master Control Panel](https://play.google.com/store/apps/details?id=no.nordicsemi.android.mcp) to upgrade the BLE app

![](https://github.com/SeeedDocument/Grove-Node/raw/master/img/Ota-ui.png)

More information can be found at [mbed.org](https://developer.mbed.org/teams/Bluetooth-Low-Energy/wiki/Firmware-Over-the-Air-FOTA-Updates).

## Develop New Application

See [ble on mbed.org](http://developer.mbed.org/teams/Bluetooth-Low-Energy/)

## Resources

* [Grove - Node v1.0 schematic pdf file](https://github.com/SeeedDocument/Grove-Node/raw/master/res/Grove-Node_v1.0.pdf)
* [Grove - Node v1.0 eagle design file](https://github.com/SeeedDocument/Grove-Node/raw/master/res/Grove-Node_v1.0_eagle.zip)