Cytron Technical Forum

Hi,

I have purchased the PR7 and assembled it all, but I am having problems getting it to work. On the first time I turned it on, the fan started to work on the SD02B circuit, but then promptly stopped. Now I can not get it to work at all. The only thing that works are the LED's on the PR7 circuit. Does it need to be programmed before it will work? I thought that it came with sample code already programmed? Please can you advise what the problem might be.

Thank you,

Nick.

Yes, the mcu is pre-programmed with the hex code. It should work by just plugging in to the IC socket if everything else is correctly done.

First of all, the Power led of SD02B is not lighted up. It should light up once the power is connected. Can you carefully check the voltage of Vmotor pin at SD02B? It could be loose wire connection which caused the power outage at SD02B, since PR7 seems to be running.

Thank you for the reply. I don't have a voltmeter to hand, so I just used a piece of wire to connect the two parts in your diagram. When doing so, the green light on the SD02B board lights up. So does this mean there is a loose connection on this board somewhere?

njburrett WROTE:I just used a piece of wire to connect the two parts in your diagram.

You mean connecting GND to Vmotor as shown in the diagram? That will spoilt the board!

If you mean connecting Vmotor of PR7 and Vmotor of SD02B, then yes. It shows the connection between these two points are loose.

Connecting between Vmotor of PR7 and Vmotor of SD02B the light still is off on SD02B, so I assume that means it's not the connection between the two boards which is the problem. Only with a direct connection between GND to Vmotor of SD02B does the light turn green.

That's abnormal. Can you take out PR7 from the system and directly connect 12V to Vmotor and GND of SD02B? You don't have to connect anything else to SD02B at this point. Then press Reset once and press Test button to see if the motor moves.

Hi,

Please Test your SD02 board standalone without PR7 to see whether SD02 working properly.

1. Just Power ON the SD02 board with the battery by connecting battery supply to vmotor, and gnd.
2. select Jumper on SD02 as Vmotor.
3. Then Observe that the PWR LED on SD02 is ON ?
4. press Test Button to test the SD02. Observe to see the Stepper motor rotate or not? the X, !X, Y, !Y LED blink or not?