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After you have loaded this app onto a Wixel, the Wixel will appear to the computer as Virtual COM Port (with USB
product ID 0x2200). If you are using Windows, you should see an entry labeled “Wixel” in your Device Manager in
the “Ports (COM & LPT)” category while this app is running. You can not send or receive data on this COM port. Its
only purpose is to let the Wixel Configuration Utility easily get the Wixel into bootloader mode.
Parameters
• radio_channel: The channel number is from 0 to 255 and determines which frequency to broadcast on. The
default is 128. Wixels must be on the same channel to communicate with each other. To avoid interference,
Wixels that aren’t supposed to talk to each other should be at least 2 channels away from each other. For example,
you could have one pair of Wixels on channel 128 and another pair on 130.
• Pm_n_link: The link ID of pin Pm_n where m is the port number (0–2) and n is the pin number (0–7).
Default Settings
The default settings are:
Pin Link ID Function
P0_0 -1 Input with pull-up resistor.
P2_1 (red LED pin) 1 Output linked to P0_0 on the other Wixel.
Therefore, if you load this app onto two Wixels using the default settings, they should behave as follows: If nothing
is connected to either Wixel’s P0_0 line, the red LEDs on both Wixels will be on. If you connect the P0_0 line of one
Wixel to GND using a wire, then you should see the red LED on the other Wixel turn off. This demonstrates the basic
operation of the app.
Example Uses
• A Wixel output pin can be used to control an LED. Be sure to use an appropriate current-limiting resistor in
series with the LED (e.g. 1 kΩ)
• A Wixel input pin can be used to read the state of a button or switch. Connect the button or switch between
the input pin and GND, so that when the switch is open the pin will read high, and when the switch is closed the
pin will read low.
• A Wixel output pin can be connected to an input pin on another microcontroller.
• A Wixel input pin can be connected to an output pin on another microcontroller. The output must not drive to
a voltage higher than 3.3 V. If your microcontroller is running at 5 V you could get around this by using a diode
or putting your output pin into open-collector mode (never drive high).
Caveats
• A change on an input pin will usually be reflected on the corresponding output pin(s) within 10–100 ms,
but every radio packet has a chance of being lost so there is no guaranteed latency. Therefore, this app is only
suitable for very low-speed digital signals such as the signal from a pushbutton or the signal used to control an
LED. This app is not suitable for PWM or RC servo signals.
• This app uses digital I/O which means that every reading is transmitted as a 0 or 1. This app does not support
analog voltages.
Pololu Wixel User's Guide © 2001–2014 Pololu Corporation
9. Wixel Apps Page 45 of 64
- 1. Overview 3
- Green USB LED 6
- Yellow LED 6
- 2. Contacting Pololu 8
- 3. Getting Started 9
- Wixel in bootloader mode 12
- README.txt 15
- 4. Configuring Your Wixels 20
- App Configuration 21
- Writing to a Wixel 21
- Reading from a Wixel 21
- Other Commands 22
- 5. Connecting Your Wixels 23
- VALT Power Output 24
- Low Power Considerations 24
- 3V3 Power Output 24
- 6. Using a Virtual COM Port 28
- 8. Schematic Diagram 31
- 9. Wixel Apps 32
- Default Pinout 33
- Description 33
- Indicator LEDs 34
- Control Signals 34
- General Parameters 34
- Pin Assignment Parameters 35
- Example Uses 35
- Versions 36
- 9.c. USB-to-Serial App 37
- Overview 37
- Installation Instructions 37
- ASCII-to-Binary conversion 39
- Binary-to-ASCII conversion 39
- Serial specifications 39
- Parameters 39
- Serial Commands 41
- 9.f. I/O Repeater App 44
- Default Settings 45
- 9.g. Joystick App 46
- Wixel Configuration 47
- 9.h. Wireless Tilt Mouse App 49
- Parts Needed 49
- Pinout of Transmitter Wixel 49
- Assembly 50
- Alternative Parts 51
- Mouse Speed Calculation 51
- 9.i. ShiftBrite App 51
- Using the ShiftBrite App 52
- Data Format 52
- Compiling Apps 54
- Creating Your Own Apps 56
- 10.c. Using the Eclipse IDE 56
- Advanced Features of Eclipse 57
- Hiding Unused Features 59
- Contributing your source code 60
- 10.f. Wixel App File Format 61
- The hex section 62
- The license section 62
- The description section 62
- The cdb section 62
- 11. The Wixel USB Bootloader 63
- Startup Procedure 64
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