Dear: LMR Just to let you know I am hoping to make a pcb for my robot in hopes I am not going to need a new chassis. Is this schematic correct because I am not so sure about the USB, the regulators, and the crystall oscilator. Thank you. From: Noah [schematic.jpg]

Schematic Observations: Insufficient capicators!!! Do the L298P require external diodes 7V from a 5 volt regulator? Reset looks wrong. L298P SENSE lines need to go to ground. What is the current load of the motors? Which schematic capture / layout tool are you using? Can you us…

Thank you and here are some questions. Dear: GG First of all I am not sure if the capacitors are insufficient. How many farads should I use for the capacitors you say? The L298p from the documentation I’ve read doesn’t require any external diodes. Do you need to see it’s datashe…

Schematic Noah, KiCad is a fine schematic editor / layout tool. You need 2 type of caps on the board. Large (bulk) to keep the voltage stable when something turns on and small to filter high frequency noise spikes. I would guess you would want at least 100uf on the +5 and multip…

Thank you. Dear: GG Thank you so much for your help. I also failed to mention that the L298p is more than enough because my motors have a stall torque of 5 amps. They preferably need one amp. I will get to work right away and I’ll make sure to ask plenty of questions. Thank you…

Okay I have a few questions. Dear: GG What is a serial port chip and how do I use it? Do you have an example circuit for what I should be doing right with the reset switch? Since the reference circuit uses diodes I am having trouble getting what to do. Do I need to follow the ci…

Serial to USB You can either add a serial to USB chip such as the FTDI or populate a 6-pin header and use an external device. The diodes on the output of the L298 are for protection. Using PWM, we switch the power to the motor ON/OFF many times per second. The h-bridge can turn …

Thanks!!! Thank you I’ll look into it.

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Is this schematic ready for layout?

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nschreiber0813 January 19, 2016, 6:50pm 4

Oh yeah one more thing.

One more thing. The 7 volts coming from the regulator is right, That is a 7 volt regulator not a 5 volt regulator. Also the 5 volt regulator is right in case you can’t tell that’s a five volt regulator.Thank you.