Technical details for those technically inclined.
Total weight is 34 grams.
USB to UART Bridge Datasheet and App notes
Axon printout (a 1:1 ratio printout of the Axon)
ATmega640 pinout quick reference
Absolute minimum required voltage is 5.35V, while the recommended battery voltage is 6V to 7.2V. Absolute maximum voltage at 10V, however most servos cannot handle above 6V to 7.2V before being damaged.
There are two power buses. ADC pins 0 to 15 are regulated at 5V, while all other pins are directly connected to your battery. There is also a 3.3V output pin (see current tolerances).
The Axon has polarity protection features, meaning that it is designed to protect itself if you accidentally plug your battery in reverse. However, it will NOT protect any external component connected to the unregulated battery bus.
This is how the pins are set up in terms of power and signal. Refer to your Axon board for pin numbers.
Pins Voltage E2-E7 battery H2-H6 battery Bat battery (input) A0-A7 battery J6 battery C0-C7 battery 0-15 5V regulated 3.3V 3.3V (output) G ground + battery - ground
The Axon has been tested to handle at least 5A on each power bus, but can in theory handle ~13A. Placing your high current draw components near the battery can up this number. This limitation is entirely based on power bus tracing thickness, meaning that if you require higher currents you must make your own separate power bus.
Individual I/O pins can supply about ~20mA power, each. Exceeding this number could damage the I/O pin.
The Axon also has a special regulated 3.3V output connector if you have any components or sensors that require this voltage. This pin cannot supply more than about 73mA, or 90mA if you aren't using USB. If you find that USB becomes unstable or fails to work when using this output, make sure you aren't overdrawing current and place a 4.7mF tantalum capacitor (polarized) between 3.3V and ground.
If you exceed the specs of the 3.3V output, you can permanently damage the USB. Do not just plug anything into it without first verifying the current draw is ok and that no voltage transients will occur.
You must also keep in mind the current tolerances of the included Hitec 572125S on/off switch.
These are the limits they quoted it at:
If you'd like to create your own CAD, feel free to download the Axon texture images.
If you have a SolidWorks design of the Axon, let me know!
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