Note 2: I use "power" in my answer because I am not sure whether the voltage or current is at fault here. So a value lower would reduce power to the stepper and prevent overheating. Note 1: Maximum value for analogWrite is 255, which is equivalent to attaching the jumpers back onto EnA and EnB pins, which means full power from the battery is being supplied to the stepper. In the Arduino Code, I used analogWrite for the pins and adjusted the written value (should be around 50-200 depending on power source and stepper motor specs) until the power supplied to the stepper is just right so it can rotate over a long time without the driver overheating). I connected two Arduino Pins with PWM functionality (Eg 45 and 46 on the Arduino Mega) to EnA and EnB. I tried removing it and the entire chip would not function at all.Ģ) I took out the jumpers from PWM pins EnA and EnB. on the chip, contrary to instructions online that indicated that is should be removed if supplying >12V. Essentially, the solution is to use the EnA and EnB pins to control the power going to the stepper.ġ) I kept the 12V Jumper ( Labelled number 3 in. Apparently the battery was supplying too much power to the driver and after awhile, the steppers will stall, probably due to the chip overheating. I got the same problem supplying 12V to power my stepper motor. *Built-in 5v power supply, when the driving voltage is 7v-35v
5v: 5v input ( unnecessary if your power source is 7v-35v, if the power source is 7v-35v then it can act as a 5v out).Out 4: Mo ( Can actually be from 5v-35v, just marked as 12v).Motors will last much longer and be more reliable if controlled through PWM. The longer the pulses the faster the wheel will turn, the shorter the pulses, the slower the water wheel will turn. Take the water wheel analogy and think of the water hitting it in pulses but at a constant flow. Motors are rated at certain voltages and can be damaged if the voltage is applied to heavily or if it is dropped quickly to slow the motor down. The voltage would be the water flowing over the wheel at a constant rate, the more water flowing the higher the voltage. In motors try to imagine the brush as a water wheel and electrons as a the flowing droplets of water. * Pulse Width Modulation is a means in controlling the duration of an electronic pulse.
H-Bridge's are typically used in controlling motors speed and direction, but can be used for other projects such as driving the brightness of certain lighting projects such as high powered LED arrays.Īn H-Bridge is a circuit that can drive a current in either polarity and be controlled by *Pulse Width Modulation (PWM).
0 kommentar(er)
