![]() Something you may not realize is that when you issue a Serial.print(), that function returns almost immediately. Serial.print() / Transmits Are Interrupt Based It pauses your program while the transmit buffer is flushed. Serial.flush() doesn’t empty the “incoming” buffer as many people think. Waits for the transmission of outgoing serial data to complete. It doesn’t help that it’s functionality changed when version 1.0 of the Arduino IDE was released.ĭoes Serial.flush() affect the Transmit Buffer or the Receive Buffer and when do you need to use it?įrom the Arduino reference for Serial.flush (found on this page): String response = unoSerial.In the Arduino library, the Serial object has a method called “flush().” Often users go throwing it into programs without fully understanding what it does. SoftwareSerial unoSerial = SoftwareSerial(2,3) Serial.println won’t work however because we need to open that Serial port so add this to setup(): Serial.begin(9600) String response = unoSerial.readStringUntil('\n') To receive data from the device we must send an ‘r’ command and then grab its response: unoSerial.write('r') With SoftwareSerial we assign two pins as our Rx and Tx Pins in this case they are set to two and three: SoftwareSerial unoSerial = SoftwareSerial(2,3) įinally open the stream and set the baud rate with: unoSerial.begin(9600) Starting with a fresh file the first step is to set the stream between Arduino and RG.įirst include the SoftwareSerial Library: #Include The UNO output is 0V and 5V and the input range of the RG-15 is 0 – 3.3V, we have elected to use a simple voltage divider that translates the 5V to 3.3V. No conversion is necessary when reading digital data from the RG-15. The input detection circuit in the UNO utilizes a converter where below 0.8V is considered 0 and above 2V is considered 1. We utilize the UNO’s 5V regulator to supply the RG-15. The RG-15 supply requirement is 5-35VDC and runs internally at 3.3V. It is supplied by by 7-12VDC (not shown) and an internal 5V regulator. The full code for this example is provided at the bottom of this page. In polling mode the RG-15 will send data back whenever it is sent an ‘r’. In the pdf provided explains how sending specific characters can command the device. Our goal is to send all data from the RG through the Arduino and right to our computer. Much like an Arduino the RG-15 sends and receives serial data. Some helpful information for the RG device is found in this pdf: RG-15_instructions. For tutorial purposes we will be using an Arduino Uno for programming but the general principle is the same between devices. While we have an Arduino Library available this example provides a way to make your own Arduino Scratch file without using our provided one. ![]()
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