Forum >Replies by 347945801
Replies （20）
- You Reply: When I say wake-up, I mean to wake up the master with the clock module, because only the master can enter the sleep mode. You can go to the wiki of the clock module to find the specific usage method.
- You Reply: The IIC on the dfrobot board is pulled up to 3.3v with a 10k resistor, and the IIC of the board you are using is pulled up to 3v with a 45k resistor. I am not sure if it is not working properly because of this reason. If you can provide another ESP32 The schematic diagram can facilitate us to further determine the problem.
- You Reply: I think you may need a clock module to wake up the main control, and then perform measurements. It may not be successful to set the delay with the main control alone.
- You Reply: This sensor can measure alcohol in a volatile state, which is generally present in the breath of people who drink alcohol, and can be used to detect drunk driving.
- You Reply: I don't know how you will move the microphone, but I don't recommend you to use the flying line method, which will increase some unnecessary noise.
- Topic: DFPlayer module and checksumYou Reply: The calculation method of the checksum is run by the following code.
uint16_t DFRobotDFPlayerMini::calculateCheckSum(uint8_t *buffer){
uint16_t sum = 0;
for (int i=Stack_Version; i<Stack_CheckSum; i++) {
sum += buffer;
}
return -sum;
}
There may be an error in the wiki, and we will revise it in time. - You Reply: DFRobot has two DFPlayer modules, but neither of them can play different audio files at the same time. You can add different channels to the audio files, which can be played by the same module.
- You Reply: You can check the power supply, it is possible that the board voltage of DFRobot is not enough to drive the sensor.
- Topic: ESP32-S2-SoloYou Reply: I think you can use it to output pwm signals, which can drive some simple motors and servos.
But many motors with encoders require professional motor drive boards. - You Reply: Your array is defined with char, but the content is of type uint8_t, so you need to change one of them. The definition and content type should be consistent.
If your intention is to convert ascii codes into characters, it is best to use characters directly. - Topic: DFR0768 Does not workYou Reply: I re-examined your question, and I think your problem is that the soft serial port cannot communicate. You need to check whether the soft serial port is connected reversely. I don't think there will be any problems with the product and software.
- You Reply: You may not install the sensor library into the Arduino library.
You can download and install the library file according to the method in the wiki. - You Reply: This mini version of the product does not have enough space for the on-board power management chip, and the external input voltage can only be 3.3V. For your request, I will give feedback to the product manager. Thank you for using it.
- Topic: SEN0395 radar moduleYou Reply: The product you inquired about, it can't take on the function of distance measurement, as you know, it can set 4 measurement ranges and output true or false to judge whether a person is detected.
- You Reply: Before using dissolved oxygen sensors, you need to calibrate them. Two calibration methods are mentioned in the wiki, and calibration codes are provided.
- You Reply: You can try Mind+, which is similar to makecode, and you may be able to find arduino ideas from it.
- You Reply: You can try the following Mind+, we made compatibility in Mind+.
- You Reply: Sorry, our firmware source code has not been open sourced.
- Topic: SEN0395 radar moduleYou Reply: Of course, you can ask any questions.
- You Reply: You can see this kind of products in our wiki, we will all lead out the pins if you can change the IIC address. I don’t know what the AD and AL pins of the purple product mean, after all, I don’t have any information about it.