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I used i2c not SPI protocol, i think if you look up your specific arduino board pinout you should find the appropriate pins on your board and then declare them in the program. Look into the library wire.h to simplify the use of SPI.-also search for an SPI library on the Arduino IDE.I hope this helps
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did you get to try it out?
Arduino Nano Altimeter Usin...View Instructable »
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A compact, Arduino altimeter for RC Planes
as long its a 3cell Lipo it should work. 800mah can still give you about 10mins. depends on your throttle management. also with lower capacity comes lower peak current (at the same C rating, since C*capacity=maximal discharge current) so you will have less power. but for a slow flying plane 800mah should be fine. I use 900mah 3S on a plane (FT tiny Trainer) that is probably a bit lighter and has 1m wingspan. its got still plenty of speed (actually pretty fast).
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two servos are max 10$arduino nano is about 5$battery is tricky, i would guess about 10$ maxif you already have soldering iron, some cables, hot glue.i dont know about the tank tracks, i searched and found nothing, so youll have to make them or use LEGO ones idk.
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@Constructed get the eachine Tx02 instead for a cheap fpv camera, works well, has 200mW and is even lighter than the one you recommended. (source: have used several AIO cameras for eachine h8 mini and other micro quads)
excuse my late answer. I did not use any additional circuitry, I guess the spring in the relay I used was weaker than yours... got it cheap from here (https://de.aliexpress.com/item/Free-Shipping-5pcs-lot-1-Channel-Isolated-5V-Relay-Module-Coupling-For-Arduino-PIC-AVR-DSP/32246609435.html?spm=2114.13010608.0.0.isYlfK)
Arduino Distance Detector with a Buzzer and LED's
I added some lines of code to use a 10 LED bar, also I changed the range to 2m. @flynn_munroe I assume this line: /* distance = (duration/2) / 29.1; */ is for setting the measure to centimeters? I am surprised with the range and "precision" of this cheap module.thanks for the great instructions!
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Convert a Servo to switch on and off LED's
used this trick to operate a relay that controls DIY positioning lights made from 12V LED strips that i had laying around. the servo switch gets power from the receiver and the relay is positioned between the balance connector (I use a 2S Lipo and a step up converter to get 12V) and the LEDs. sorry for bad image quality.