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Most likely tying your digital ground to the earth ground should be fine and this is a very common approach, but there are various factors that affect the decision for your system. If you digital ground is not at a different potential from ground you may want to do this. You could try first...
It sounds like an ESD pulse is causing the problems. Is the LCD well-grounded to the board? It may also help if the metal case is grounded. Or alternatively isolate the LCD electrically from the case.
Good thought, thanks. But my understanding is they use some pairs of wires for power only, and other pairs for data only. I'm trying to get everything on one pair.
I'm looking to develop a driver that can deliver 12-24VDC over two wires, while having the ability to modulate the output to transmit messages.
Imagine a differential pair bus (like RS-485), but instead of 5V, running at 24V. So when wire A is high (24VDC) and wire B is low (0V) the potential...
Hi, that looks like a suitable approach, although what I don't see there is a sweep generator which would control the PWM frequency. You might instead consider an IC that's intended for such an application, or something like a 555 timer that you could adapt to this application.
Also, I assume...
Hi Nick. Are you trying to produce a pulse, or a sine wave? Are you converting the PWM output back to analog with a filter?
You have two basic controls on a PWM: frequency and duty cycle. Generally with a micro you control these by setting the clock source and frequency, total PWM cycle...
What type of battery is it (what chemistry)? Typically equipment is designed to not use batteries at low voltages to avoid over-discharging them, which can lead to shorter life or complete failure. It depends a lot on the type of battery.
It's best to place your snubber at the load, in my opinion, and you should probably use one at each inductive load. You wouldn't want to use a diode across the relay contacts in an AC circuit.
Here is a page that may be of more help...
Thanks for your suggestions.
I checked with the scope and it looked good, but after some more troubleshooting I realized that I was actually turning off the driver prematurely. I was monitoring the TX1IF flag after sending the last byte to know when to disable the driver, but it's set after...
As indicated by the error messages, try turning on your LVP bit if you are actually using LVP. If that doesn't help, the most common reason I've had for problems like that was simply bad or incorrect connection between the programmer and the device. Double check all your wiring to the...
Are you able to step through the code? Do you know if it exits with the error code because i==0 or because (ReadRawRC(ErrorReg)&0x1B)? When you call this in other places and it works, are you also using PCD_TRANSCEIVE? For example, could ReadRawRC never give a result of 0x01, 0x10, 0x20, or 0x30?
What you have is probably essentially OK. You would just need to size the power drivers accordingly to handle the current/voltage/power required. You showed two, but may only need one. There are plenty of FETs that can handle 35A or more. I would probably pick something at least double the...
I'm not sure exactly what functions like 'RS485Slave_Receive' and 'RS485Master_Receive' do, but in general it looks like the master doesn't do anything with dat when it's received from the slave, and for that matter the slave never sends anything. It looks like the master is set up to only...
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