WaziDev User Manual
WaziDev is a powerful development board for creating IoT application. It is based on Arduino and LoRa radio network. This document guides through the preparation of programming environment for WaziDev. It will also show step by step:
- how to connect your sensors,
- how to write the code,
- how to compile and upload the code,
- how to see and use your sensors in the cloud.
This documentation is available in PDF format.
To follow this user manual, one will need the following hardware:
- a WaziDev board
- a Micro USB cable
- a DHT11 sensor
Note that the Micro USB cable must be a “data” cable. Some cable sold on the market are just for power, and they won’t work for the WaziDev.
In terms of software, you need:
For the examples using the cloud, one also needs a configured WaziGate.
This section will guide through the installation of Arduino IDE and its configuration for the WaziDev.
Step #1: Download Arduino IDE from here: https://www.arduino.cc/en/Main/Software
Download what suits your computer (Windows, MAC, Unix). Here we have as an example some screenshots for Windows users. When the download finished, one need to proceed with the installation and to allow the driver installation process in case a warning from the operating system is detected. Choose the components to install:
Step #2: Choose the installation directory (recommended: keep the default one)
The process will extract and install all the required files to execute properly the Arduino Software (IDE)
If you use Linux there is a guide here: https://www.arduino.cc/en/Guide/Linux.
If you use Mac there is a guide here: https://www.arduino.cc/en/Guide/MacOSX.
In this section one will configure the Arduino IDE to use the WaziDev sketchbook.
Step #1: Download the WaziDev sketchbook. Unzip the file to the location of your choice.
Let’s say one unzipped the file to /home/cdupont/WaziDev-1.0 for example. Next step is to configure Arduino IDE to use this sketchbook.
Step #2: In the Arduino IDE Preferences, change the “sketchbook location” to the WaziDev sketchbook folder.
First, open “Preferences” in the Arduino IDE menu File -> Preferences.
For example, change the “sketchbook location” to “/home/cdupont/WaziDev-1.0”, if that’s where you unzipped the file.
In this section, we will configure the various parameters of the Arduino IDE to work with WaziDev on you PC.
Step #1: Connect your WaziDev board to your PC via USB cable.
If you see some lights turning on, that means your USB connection is working.
Step #2: Open your Arduino IDE.
On Linux, you need to open it as an administrator (i.e. type “sudo arduino”). You should see something like this:
Step #3: Select the right port.
In the Tools menu, click on the Port submenu. The port depends on your Operating System. You should select a port similar to these:
- Linux: /dev/ttyUSB0
- MacOS: /dev/cu.usbserialXXXXX
- Windows: COM3 or higher.
Attention: If you don’t see the corresponding port in the Port menu, then you need to install the required drivers.
Step #4 (optional): Install the drivers. Skip this section if you already see the right port in the port menu.
Please follow the instructions on the page and install the corresponding driver on your computer. After installing you should be able to see the port and the board information in your Arduino IDE under the Tools menu.
Step #5: Select the Board.
Select the board “Arduino Pro or Pro Mini” in the Tools -> Board menu.
Step #6: Select the Processor.
Select the processor “ATmega328P (3.3V, 8 MHz)” in the Tools -> Processor menu.
Finally, the Programmer needs to be “AVRISP mkll”.
The WaziDev presents a number of “pins” where you can connect your sensors and actuators.
The full list of pins can be found in the Reference section.
In practice, you use either the “Digital” pins D2 to D12 or the “Analog” pins A0 to A7 to connect your sensorsi and actuators. For example, here is how to connect a DHT11 temperature and humidity sensor:
WaziDev programmable pins provide 3.3v with maximum current of around 20 mA. How to control sensors or actuators that require more voltage (e.g. a 12V water valve) or drain more current (e.g. a GPS sensor)?
We can use high current/voltage pins M8 and M9. They can be programmed through digital pins D8 and D9 respectively. It can be used to activate high current/voltage devices/sensors. The maximum current which can be drained is 500mA and the maximum voltage is 12v. The wiring is as follows:
- the ground wire of the external high current/voltage source is connected to the same ground of the board (GND),
- the positive wire of the power source is connected to the high current device that needs to be controlled by our board,
- One of pins of M8 or M9 is connected to the Ground of the high current device.
We can now can turn it on and off by writing HIGH and LOW to the digital pins D8 or D9 respectively.
In this section we will go through several detailed examples to use your WaziDev:
- WaziDev Hello World: a simple blink program,
- how to plug in and use a sensor,
- how to test the LoRa communication,
- how to send sensor values to the Cloud.
Let’s try now the WaziDev! Upload the first program.
Step #1: Select the blink program in the examples menu.
Select the menu File -> Examples -> 0.1 Basic -> Blink.
Once this is done, the “Blink” program should appear in the editor.
Step #3: Compiling and uploading the code to WaziDev.
Click on the arrow button to compile and upload your program.
If you see no errors on the status bar and see the message “Done uploading”, you have successfully flashed your WaziDev.
If everything goes well, on the WaziDev a blue LED should blink every one second.
Congratulations!! WaziDev is working. :-)
One may play a bit with the source code and change the blinking frequency by changing the number 1000 behind the delay keyword to some other number. It represents the delay time between status change of the LED measured in milliseconds. Once values are changed upload again to WaziDev and check the change in blinking frequency.
In this example, a temperature and humidity sensor: the DHT11, will be wired and programmed.
Step #1: Connect the DHT11 to the WaziDev.
With the DHT11, the simplest wiring possible is: no wires! DHT11 have a GND (ground) pin, a data pin, and a VCC pin. Just plug the DHT11 directly into the WaziDev. Be careful to align the pins:
- DHT11 GND -> WaziDev GND
- DHT11 data -> WaziDev D2
- DHT11 VCC -> WaziDev D3
Step #1: Connect the DHT11 to the WaziDev.
Step #2: Select and tweak the DHT11 example.
This example is located in File -> Sketchbook -> sensors -> Temperature -> DHT11.
We need to modify slightly this example to work for our wiring.
Since the DHT11 data pin is connected to the WaziDev pin 2, we need to change that fact in the code. Locate the line:
#Define DHTPIN 6
And change the value from “6” to “2”.
The next trick is to set the WaziDev pin #3 to HIGH, in order to power the DHT11. Locate the line:
pinMode(7, OUTPUT); digitalWrite(7, HIGH);
Uncomment that line, and change the two values to 3.
Step #3: Compile and upload the code.
You just need to hit the arrow button.
Step #4: Open the Arduino IDE Serial Monitor.
In the Tools menu open the serial monitor and then set the data rate to 38400 baud.
You should see both temperature and humidity displayed.
We’ll now reuse our DHT11 to upload data to the Cloud. Note that you need an active WaziGate close to you.
Step #1: Plug in your DHT11 as shown in the previous example.
Step #2: Select the LoRa_DHT11 example.
It is located in the menu File -> LoRa -> LoRa_DHT.
Step #3: Adjust the source code.
Verify that the Pins are correct in the file “my_DHT_sensor_code.h” visible in the Arduino IDE.
In the file “LoRa_DHT.ino” find “#define node_addr 8” then change the number 8 to your desired number (for example: the number written on the wazidev label).
Step #4: Compile and upload.
You should obtain a successful upload. At this stage, your device is already sending data to the Cloud! Verify it by opening http://dashboard.waziup.io/devices.
You should find your device right away:
You can click on that device and see the sensor values and history:
You can find below the specification of the WaziDev.
ON/OFF switch: This jumper can be used as on/off switch for the board. It is ON by default.
Regulator Activation: The jumper indicated by DIRECT / REG sets the board to use a regulated voltage or direct. The direct setting is only if you use an input battery of maximum 3.6V any voltage higher than that can damage the LoRa module. Please note that to always keep this config in REG mode when programming the board.
Analog Pins: Arduino standard analog pins A0-A7. Please note that A7 is connected to the battery voltage level monitoring circuit which can be activated by setting the digital pin D7 to LOW, so D7 should be set to HIGH always.
External Antenna (UFL): The board has an embedded PCB antenna which is activated by default and optimized for 868MHz frequency. If you want to use your own antenna instead you need to deactivate the PCB antenna by cutting its jumper on the back of the board indicated by JA then you can connect your antenna to the UFL connector.
High current pins ( max 500mA ): M8 and M9 are high current/voltage programmable output pins. They can be programmed through digital pins D8 and D9 respectively. It can be used to activate high current/voltage devices/sensors. The maximum current which can be drained is 500mA and the maximum voltage is 12v. The wiring is as follows: The Ground wire of the external high current/voltage source is connected to the same ground of the board (GND), and the positive wire of the power source is connected to the high current device that needs to be controlled by our board. One of the pins of M8 or M9 is connected to the Ground of the high current device, then we can turn it on and off by writing HIGH and LOW to the digital pins D8 or D9 respectively.
Digital Pins: Arduino standard digital pins D2-D12. Please note that D13 is situated on the opposite side of D12.
VCC ( 3.3v ): WaziDev board operates with 3.3v, VCC pins provide 3.3v as output, they can be used as input voltage as well.
Lipo/regular battery: This port is designed to be used as input for Lithium Ion rechargeable battery or just a regular battery. There is an onboard charger which enables the board to use a solar panel. Please note that the solar panel must be connected to either Micro USB port or VIN pin. Warning: your rechargeable battery must have its own protection circuit otherwise it might gets overcharged and cause fire. (usually good quality batteries have it)
Micro USB port: This port is used to power the board on through USB cable and program the board via Arduino IDE.
Below you can find the list of jumpers with their function:
- JL: LED13 and PWR LEDs
- JC: Charger status LEDs (CHG, FULL)
- JB: Battery level read
- JA: Embedded Antenna
- JS: Power Switch
- JR: Radio Interrupt
By default, Jumpers JL, JC, JB and JA are connected; JS and JR are open. When connected, connects the LoRa interrupt pin to D2
- MCU: ATmega328p 8Mhz
- RAM: 2 KB
- FLASH: 32 KB
- Standard: LoRa
- Frequency Band: 863-870MHz for Europe/Africa
- Channelsi: 1
- Transmit Power: +20dBm -100mW constant RF output
- Receiver Sensitivity: -148dBm
- RF Data Rate: 300kbps
- Modulation: FSK, GFSK, GMSK, MSK, OOK
- Function: Sensor Node
- Antenna connector: Integrated PCB antenna / External UFL
Indicator and Button
- LED: PWR LED, Indicator LED, Charging/Full battery
- Button: 1 reset button
- On/OFF switch: 1, two pins for on/off switch + a jumper to keep the board always on
- Regulator Switch: 1, A jumper that can be used to bypass the regulator for low power applications
- UART: 1
- ICSP: 1
- I2C: 1
- Analog input: 8 (Arduino standard pins: A0-A7)
- Digital I/O: 9 (Arduino pins, some are used by LoRa)
- Extra GND
- High Current output
- Supply voltage: 3.3V 3.3V - 5V 3v (max 3.6v DIRECT and 6v Regulated) Max 1A input current (through Micro USB port)
- Operational Temperature Operating Humidity: -20 ~ 70 C, 5% ~ 95% Relative Humidity, non-condensing
- Dimensions: 70 x 40 mm
- IDE: Arduino compatible (Select Pro Mini 3.3V 8Mhz)
If you have a WaziDev V1.3 device and want to use LoRaWAN some changes are needed. Note that WaziDev V1.4 is already capable of LoRaWAN, without changes. On your WaziDev V1.3, it is required to solder a small cable between the D3 pin of the WaziDev and the LoRa chip, as can been seen in the image below. You also have to close the JR solder pans together with a welding point. To do this you will need:
- A welder
- A connecting cable about 2/3 cm long
Proceed as follow:
- solder one extremity of the cable to the D3 pin of the WaziDev
- solder the other end of the cable to the 2nd pin of the LoRa chip. You need to be quite precise!
- solder the JR pads together. This is quite easy, you just need to apply some weilding to join the two pads of JR together.
That’s it! You should now be able to upload LoRaWAN sketches to you WaziDev. Technically, we need this change for the LMIC library, that we use for LoRaWAN.
- Closing JR will connect LoRa DIO0 pin to the Pro mini pin D2.
- slodering the wire will connect LoRa DIO1 to the Pro mini pin D3.