You can make voltage divider in very smart way by utilizing 3 resistors of the same value. You can just make "Y" shape divider as a part of the cable - photo attached. I just didn't want to have more cables than needed in my timer. I placed small PCB with the voltage divider on RX and TX pins. On the other line the Pi is transmitting at 3.3V and Arduinos are only receiving so it is save without voltage divider or level converter. Converting the logic level is only required on the line where Ardunos TXes are connected to Raspberry's RX, cause Arduino transmits at 5V. Arduino operates at 5V logic level and Raspberry at 3.3V. ![]() It is caused by the difference of voltage tolerance between the Arduino and the Raspberry. Arduinos TX pins have to be connected to Raspberry’s RX pin (pin 10 - UART0 RX) via voltage divider or with logic level converter. The common Arduinos RX line has to be connected to Raspberry’s TX pin (pin 8 - UART0 TX). Following newer schematis and using official RotorHazard PCB is adviced (but not necessary). Nevertheless - method existing right now is proven to be working so you can act right now :) Edit (Q4/2020): This manual would work but there is much newer schematics and features now. Feel free to use software right now, but if you are concerned about all wiring that is required right now - some people are - you may want to wait. You can also read about history of this project later in the instructable.ĭisclaimer/plans: Obsolete: There is a good chance that in few weeks (Q1/2020) much simpler method of flashing will be provided.Read this instruction at least one time before performing the mod so you will know what to expect.Make sure that you have internet connection. ![]() You can use both or utilize just one of those. ![]() Consider this as a combined improvements for software and hardware. It will bring new functionalities to your timer and you will have ability to update server and nodes "Over The Air". If you are using RotorHazard FPV race-timer or Delta5 timer - this tutorial is for you.
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