Hello,
I have recently order and receive an ultrasonic sensor : MB7389 HRXL-MaxSonar-WR (MaxBotix). I do tests and when I vary the distance of the target, the analog output (pin 3) don’t vary and stay block on 0,305 mV. This result is the same for others outputs (No variations for Serial and pulse width).
Power supply : 5,2V
Current draw : 3 mA
Anyone know the source of this problem ? (You can see attached the values on each pins during the test)
Thank you for your help
Maxime
Hi,
Can you confirm that the power supply of 5.2V is connected to pin 6 and ground to pin 7 as in the attached image ?
Can you send us a picture on the soldering of the sensor (both sides). Sometime bad solder can cause this type of problem.
Best regards,
Hello,
I confirm, power supply is connected on pin 6 and GND on pin 7. I have measure the output voltage between pins 3 and 7.
Hi,
Thank you for the picture but it is not very clear. We would need to see clearly the soldering from the top view and the bottom view ( 2 pictures) in order to help.
I can’t do a good photo of the soldering now. I will send tomorrow. But apart from this problem, where it could come dysfunction ?
Best Regards,
Maxime
Hi,
One other source of problem may be what is plugged to the sensor. Try unplugging the analog pin and measuring voltage to make sure it is not the microcontroller or anything else plugged on the other side that is keeping the voltage low.
Hi,
I have already try to do this and the voltage value stay at 0,305 V.
Thank you for your help,
Maxime
I can’t do a better photo. What are the risks of a poor solder ? If I change my solders, the sensors can it operate ? Have you any other idea about the reason of this problem ?
Best Regards,
Maxime
Hi,
If there is one bad solder joints, it can affect everything. This is a common problem where people have bad solder joints and think the circuit is defective. It should not damage the sensor if you did a bad solder joints so yes, if the solder joints are re-done properly, the sensor will be to operate correctly. Without any clear picture, we cannot tell you if they look fine or not. Best regards,
Hi,
It is still hard to see. The white wire looks suspicious, but it may just be due to the quality of the photo. Please try to heat the solder joints again and try one last time. If you are still having problems, we will exchange the module.
Please take a look at the following image to have an idea of you solder joint quality.
Best regards,
Hi,
The solder needs to be like your photo on the two sides ? My solders quality looks like at the fifth solder on your photo.
This morning, I will try to improve solders if it’s possible.
Best Regards,
Maxime Dekhissi
Hi,
My headmaster has did new solders himself this morning and there is no better results.
Best Regards,
Maxime
Hi,
Thank you Maxime for trying. We will transfer you ticket to the exchange department, they will contact you soon with he procedure for replacing the new product.
Best regards,
Thank you for your help
Best Regards,
Maxime Dekhissi
Hi,
The exchange department will contact me or should I contact them ? In this case, where can I contact them please ? What is the delay for an exchange ?
Best Regards,
Maxime Dekhissi
Hi,
They should contact you pretty soon if not already done. Usually, the process is pretty quick, you can ask them about the specific delays if there are any.
Best regards,
Hello,
I found the problem. I changed my power supply and the sensor operates. I don’t know why the previous power supply doesn’t operate. That’s why you can find a schema of power supply if you have an idea from where the problem can be.
However, the electrical values are good.
Supply Voltage : 5,2V
drawn currant : 3mA
Best Regards,
Maxime
Happy to hear you resolved the issue.
Hello,
Have an idea about the source of the problem ? Why a power supply that provides 5,2V doesn’t operate the sensor ?
Can the problem come from zener diode ?
Best Regards,
Maxime
