Here is a clearer image of my oscilloscope readings with the time scale shown:
I still have to add in the bypass capacitors that I'm using but here is the main circuit and part id's:
I'm using 3 AAA batteries from Duracell for my power source which should be able to supply the required current to the motor. Based on the data sheet of the motor, the maximum rated load current is 270 mA and the starting current is 1300 mA max. However, because I'm using PWM, I am not sure if...
Okay, so I tried the suggestions you made and added in a few more capacitors. I did notice a reduction in noise on the oscilloscope but I still have the same problem at high duty cycles.
Here's a picture of the output signal of my 555 timer when the motor is running. There is a noisy spike...
Wow, great response time and advice. I can't thank you guys enough!
I have already placed a bypass cap between vcc and ground (which I thought was to reduce spikes) and have a flyback diode in parallel with the motor as well.
Should I switch the bypass cap from vcc to ctrl, or should I just add...
Yeah, I watched a few videos on the internal workings and learned how the comparators create the flip flop but did not dive any deeper than that. I didn't realize all the different ways to drive the 555.
I've managed to set up the rest of the receiver circuit and I have some good news! I am...
Thanks for the advice. I was thinking that my motor was small enough to get away with 1.5 amps, however I see that it's much better to go beyond what is required while prototyping. I have ordered in some new parts based on your recommendations.
Because I don't have the parts yet to build the...
That's a clever way to get the current. Thanks!
I only took out the 555 timer to simplify the circuit for myself so I could better understand each individual component. I didn't realize the effect it would have on the current to the transistor. Should the drain current of the MOSFET be above...
So I looked into it, and it seems like current probes are very expensive. However, based on some data sheets of various IR receivers, it looks like the output current of the sensor is around 5 mA at a max. In which case I can see why my motor is not moving.
What would the solution be to...
I am using a IRF510 MOSFET, but the program I was using only had the TIP120.
Also, based on what you said, I made some modifications to the circuit, and I removed the unnecessary current limiting resistors. This didn't solve the problem but I'm sure there is a simple principle that I'm over...
1) Yes, here is a digital version of the breadboard I have wired up:
2) The MOSFET that I am using is a N-Channel transistor MOSFET IRF510 from RadioShack.
3) I'm not sure about the current, but I am getting around 4 volts from the transistor output as a square wave.
I have probed between...
Update
Since last post, I've made progress in sending the IR signal to my sensor. I am getting a visible PWM square wave that corresponds to the position of the potentiometer. However, I have not been able to drive the motor with my current setup. The schematic that I am using is a simplified...
Hey, so just a quick update. I realized the problem with my circuit and why the envelope was not working. I was mixing the old schematic with the new one and I had a few wires in the wrong place. I believe I have fixed it and am now seeing the envelope, which is awesome. Now I just have to fine...
Okay, I'll check that when I get a hold of an oscilloscope again.
Here are the link to the two videos:
You can see the pwm signal with the blinking LED. I also show it on the oscilloscope as well
Alright, I finally got a chance to upload some videos of the circuit in action!
I can't tell why I'm not getting the correct output for my second 555 timer. I have double checked my wiring and everything seems fine.
As shown by the videos the first 555 timer works perfectly, but the second one...
Thanks, I didn't think to try that. At this time, I have only probed the output of the 555 timers individually.
I am still working off the same schematics as before. Thus, the IR_TX_RX_8 model you sent is a good representation. I have some video of the circuit and the LED which I'll try to...