12/9/2023 0 Comments Both i2c and spi arduinoUse as low a frequency as possible for your application.Think about using other protocols rather than SPI or I2C, which are designed for short distance PCB connections.You might be able to calculate the wire length, but there are a lot of variables, so a definite answer is unlikely. This means that, to a first approximation, you can think of the wire and the driver as an RC filter, so your nice square pulses no longer look like squares. Therefore, as your wire length goes up, the capacitance goes up. A pair of wires has a capacitance between them, measured in \$Fm^\$. The limiting factor is the capacitance of the interconnecting wires. How can I calculate the wires' length, which doesn't distort the waveform strongly, if I want to set the SPI clock frequency to 8 MHz?Īlso, in contrast, if I choose the 400kHz Fast Mode I2C, how long can I extend the wires? I really want to read the IMU data with an SPI clock of 8 MHz. I prefer to use SPI because it is faster than TWI.īut if I set the SPI clock frequency to 4 MHz or 8 MHz, I noticed that the SPI signals become a sawtooth wave, not like a pulse wave, if the wire gets longer. ![]() My situation I have to make a long wire to place this IMU sensor on a table. Note that the Arduino DUE can set the SPI clock using setClockDivider()Īnd I generated 1MHz, 4MHz, 8MHz clock frequency. 20MHz SPI serial interface for reading sensor and interrupt registers (MPU-6000 only).1MHz SPI serial interface for communicating with all registers (MPU-6000 only).400kHz Fast Mode I2C for communicating with all registers. ![]() This IMU sensor supports both Serial Peripheral Interface (SPI) and Two-Wire Interface (TWI, I☬). I'm using Arduino DUE to read data from an IMU(inertial measurement unit) sensor ( MIKROE-1577, MPU-6000)
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