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Hi Barry,
The power 12V to the relay, I removed it to see if the coil affect anything, and I changed it like a switch. But unfortunately, when I turn ON the switch, it act like short circuit and make my 8051 system failure.
Look at the two 12V supplies, if I used only one 12V supply, when...
Hi barry,
They do not share ground, when share ground, the weighing system hang. There is flyback diode at relay. See my sketch, I did not draw the diode but there is. I disconnect the relay and make a manual switch, seems like short circuit, but I do not know why?
Hi KlausST,
See attached image.
Hi All,
I am controlling 5 valves operation using 8051 with a 12V/5V power supply, it works well to control all the 5 valves I need. At the same time there is a weighing system will turn ON and OFF 6th valve by it's relay. Problem happened when both system operate together.
When the relay at...
Hi All,
I am using pneumatic motor to run one of my project, how to stop the pneumatic motor precisely at the location I need when sensor detected. Now the motor is having momentum so there is around 20mm ~ 30mm displacement after the valve cut off. Using flow control valve can slow down motor...
Sounds like you are making yourself a digital stop watch. There are various method to make the timer, it depends on how complicated you can accept on your hardware and how accurate the timing system. See below link, may help you.
https://www.circuitstoday.com/digital-stop-watch
Hi All,
I am testing my program using microcontroller to control the electric valve 12V. The program is wrote to control the valve for operating the machine which will have repeat cycle. The program works well and the valve works as programmed. I had wrote to loop the programe so the valve can...
Hi Screepss,
I had tried to make a delay for 2.4ms, the result are same. And I tried to change my switch circuit using 74HCT541 Buffer instead of 10 pull down resistor, but the result become worse. The 8051 is giving output once reset and no button was pressed, there was nothing happened when I...
Hi All,
I had done a programme with as below, all Port 1 haspull down 10K and individual switch.
JNB P1.7,$
START: JB P1.1, FLV_1
JMP Start
The programme works as expected, but the problem is, when I continuously press button at P1.1, the...
Hi Genovator,
Thanks for the advice. I had re- programme the code, and now it works. WIth the timing specified, ON OFF ON OFF.
I will post another problem that I am facing now.
Hi Genovator,
I am using crystal 11.0898MHz with 89S52. The motor datasheet as below link. See page 2 about the pulse width. I do not know that I need to divide into 2 for the timing. And how do I know that the PPM used in this motor is positive or negative edge...
Pls look fr Robokit website the motor model RMCS 2104. That is the only info I hv to use the PPM in controlling the motor. Why different time of pulse given fr different control?
Hi,
I have a DC motor come with a driver attached which say can accept PPM signal. How can I write a signal pulse to trigger the motor? Reverse 0.6ms, Stop 1.5ms, Foward 2.4ms. And the data sheet say the motor will run at the last speed even the PPM signal has been disconnected. I had write a...
Hi Bigdogguru,
I am using TIP120, I have tried using BC945, from direct connection until try using 1K, 2.2K...10K resistor, both not working. The different TIP120 and BC945 is TIP120 at least give me a one shot pulse, but BC945 not working at all. I never face the pull up problem before, only...
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