![]() With no load, the 3V3 pin voltage was 3.28 V. There is no refence in the original CH340 datasheet or elswhere on the internet, so I measured the supplied 3V3 voltage directly. The CH340 chip includes the 3.3 V LDO voltage regulator, which can supply up to 25 mA. ![]() Rx and Tx LEDs are connected directly to the ATmega328P outputs PD0 and PD1, so keep that in mind in case those two pins will be used for something else than USB communication (on genuine Nano R3 board the Rx and Tx LEDs are driven by additional outputs on the FT232RL chip).For both ATmega328P and CH340, the board uses 3-pin SMD ceramic resonators with internal load capacitors, so no external capacitors for oscilating circuit are needed not they are used (although there are soldering pads provided next to the CH340 resonator).Differences to the genuine Arduino Nano R3 board To switch between VIN power supply (6-12 V) and USB power supply, the board includes a Schottky diode with low forward voltage. Most of the boards I got seems to be using the Vishay Semi SD101CWS diode (Vf 0.6 – 0.8 V at 20 mA, S4 SMD marking code). With installed driver, communication with Arduino (IDE) is clear and straightforward. The CH340 IC requires installation of driver software, which was covered and explained many times already, so I will not repeat this information. To facilitate the USB communication and to provide 3.3 V output, the board uses USB communication circuit CH340 in SOP-16 package (instead of FT232RL used on the genuine Nano R3 board), manufactured by several Chinese companies. 500 mA of original UA78M05) and lower drop-out voltage (typ. To provide +5.0 V Vcc power supply, the board uses LM1117-5.0 SOT-223 linear stabilizer 5.0 V (compared to original UA78M05), with slightly higher current (800 mA vs. There are also 4 LEDs – Power LED, LED connected to digital output pin D13, and two LEDs showing status of the RxD and TxD communication lines. The board uses same type of Mini-B USB connector, same side connectors and 6-pin SPI connector, as well as the Atmel ATmega328P microcontroller in the 32-TQFP package. The Nano CH340 R3 board is similar to the genunine Arduino Nano board, described on the original Arduino website here . Below you will find both schematics and few technical comments to the Nano CH340 R3 development board. I have purchased several Nano 3.0 CH340 clones in different orders from several Asian vendors and they are all almost identical, so it seems that this type of the Nano 3.0 board is widely used. This is a case for a Chinese clones of the Arduino Nano R3 board as well.Īfter some research, measurements and detail inspection of the boards I was able to get together all circuits. Unfortunately, quite often there is virtually no schematics, datasheets or detail description available. Although in most cases the functionality is similar or even identical to the original, there may be some differences. My motor controllers include the microprocessor used in the arduino.Because of substantial price difference, many users are using Chinese clones of the genuine Arduino development boards. I have more questions, but let's start with one. I suppose an answer that I would expect would be something like this: "attach D0 to this wire, D1 to this wire, etc." Can somebody explain to me (and perhaps to others who want to make the autopilot) how to connect the Arduino to the Motor controller? I attach a photo of the Motor controller below. ![]() ![]() I bought the motor controller at Sean's store. But what does "adc pin0 is a resistor divider" I have no idea. I am not new to Arduino, I know what are pins and pin numbers. When I open that up, I read the following, first few lines: It says there: " Everything you need to know is in the comments in the source code of motor.ino." Reading the workbook, got up to Step 9: "wiring up the Nano". I am trying to understand how to put together the pypilot.
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