Blog - All Comments

RE: "No lies" IR Thermometer - part IV

Marvian — Tue, 28 Nov 2023 21:45:29 GMT

Hi David, I have same project and I could not communicate with MLX90614. I appreciate if you share your PSOC code so I can figure out it.

Thanks,

Marvian

RE: "No lies" IR Thermometer - part II

Marvian — Wed, 22 Nov 2023 23:13:32 GMT

Hi David, I am new to PSOC5 and I love this project and try to build it but I could not to read the IR, project files the google drive link does not work and I appreciate for sharing the files.

RE: "No lies" IR Thermometer - part I

Marvian — Fri, 01 Sep 2023 16:52:25 GMT

Hi David and Every one,

I start Psoc and have CY8KIT-050 and I like this project but I couldn't communicate with MLX90614.

the link of project is not available and I appreciate it to have psoc codes to to find out my mistake.

Thanks,

Marvian

RE: "No lies" IR Thermometer - part III

Marvian — Wed, 30 Aug 2023 21:58:04 GMT

Hi Ever one.

this a project I try to do but I could not introduce MLX90614 to PSOC5.

I appreciate if you help me and give have code for reading and writing for RAM and EEPROM.

or email marvian_s at yahoo.com

RE: Multicomp Pro MP710086 DC Power Supply Review

Yorick — Wed, 30 Aug 2023 14:22:32 GMT

Hi,

I do not have the MP710086 power supply but another Multicomp power supply: MP710509

Thanks to this tutorial, I succesfully displayed the product information using Pyvisa framework, here is the python code:

[embed:dc8ab71f-3b98-42d9-b0f6-e21e02a0f8e2:a19d7896-9023-456f-a113-33a112c760e8:type=python&text=import%20pyvisa%0A%0Arm%20%3D%20pyvisa.ResourceManager%28%29%0Apower_supply%20%3D%20rm.open_resource%28%22ASRL%2Fdev%2FttyACM0%3A%3AINSTR%22%29%0Apower_supply.baud_rate%20%3D%20115200%0Apower_supply.query_delay%20%3D%200.1%0Apower_supply.called%20%3D%20False%0Apower_supply.timeout%20%3D%2010%0Apower_supply.read_termination%20%3D%20%20%27%5Cn%27%0Apower_supply.query_termination%20%3D%20%27%5Cn%27%0Apower_supply.write_termination%20%3D%20%27%5Cn%27%0Aprint%28f%22Device%20info%20%7Bpower_supply.query%28%27%2AIDN%3F%27%29%7D%22%29]

This display: Device info MP710509 V1.1 SN:00001482

Unfortunately, that is the only thing I am able to get from this power supply, here is the code when I am trying to set and read the voltage:

[embed:dc8ab71f-3b98-42d9-b0f6-e21e02a0f8e2:d6a588d5-4d94-4e19-99f1-1a5c81d9210d:type=python&text=import%20pyvisa%0A%0Arm%20%3D%20pyvisa.ResourceManager%28%29%0Apower_supply%20%3D%20rm.open_resource%28%22ASRL%2Fdev%2FttyACM0%3A%3AINSTR%22%29%0Apower_supply.baud_rate%20%3D%20115200%0Apower_supply.query_delay%20%3D%200.1%0Apower_supply.called%20%3D%20False%0Apower_supply.timeout%20%3D%2010%0Apower_supply.read_termination%20%3D%20%20%27%5Cn%27%0Apower_supply.query_termination%20%3D%20%27%5Cn%27%0Apower_supply.write_termination%20%3D%20%27%5Cn%27%0Aprint%28f%22Device%20info%20%7Bpower_supply.query%28%27%2AIDN%3F%27%29%7D%22%29%0Apower_supply.write%28%22VOLT%20%22%2Bstr%281%29%29%0Aprint%28f%22Voltage%20%7Bpower_supply.read_ascii_values%28%27MEAS%3AVOLT%3F%27%29%5B0%5D%7D%22%29%0A]

I have the following trace:

Device info MP710509 V1.1 SN:00001482
Traceback (most recent call last):
File "/home/ww_bum_evi_ci_agent1/tmp/yorick/EVI-SW.dhcom_image_generator4/step_impl/power_supply/mp710509.py", line 14, in <module>
    print(f"Voltage {power_supply.read_ascii_values('MEAS:VOLT?')[0]}")
File "/usr/local/lib/python3.10/dist-packages/pyvisa/resources/messagebased.py", line 529, in read_ascii_values
    block = self.read()
File "/usr/local/lib/python3.10/dist-packages/pyvisa/resources/messagebased.py", line 486, in read
    message = self._read_raw().decode(enco)
File "/usr/local/lib/python3.10/dist-packages/pyvisa/resources/messagebased.py", line 442, in _read_raw
    chunk, status = self.visalib.read(self.session, size)
File "/usr/local/lib/python3.10/dist-packages/pyvisa_py/highlevel.py", line 519, in read
    return data, self.handle_return_value(session, status_code)
File "/usr/local/lib/python3.10/dist-packages/pyvisa/highlevel.py", line 251, in handle_return_value
    raise errors.VisaIOError(rv)
pyvisa.errors.VisaIOError: VI_ERROR_TMO (-1073807339): Timeout expired before operation completed.

I tried a lot of other "write" commands but that was pointless, it has no effect on the power supply. And every query commands I tried ended up with timeout error (excepting "*IDN?").

Do you have any idea why this does not work for MP710509? I suspect a brand new command definition for this product (and I cannot find any documentation on the web!). Or maybe that is because it is a multi-channel power supply and I don't know how to handle the specificities of this kind of product.

Thank you very much!

RE: Working Prototype of a Kelvin (4-Wire) Milliohm Meter

jdceletronica — Wed, 05 Apr 2023 02:09:12 GMT

muito interesante , mais ten algun amigo que ja feis con arduino nano e que tenha todos os componentes aky no brasil ?

RE: Precision analog opto-isolation amplifier using HCNR200/201

VictorKhan — Thu, 28 Jul 2022 12:59:06 GMT

Hi Hassan,

I need to measure 0-60 V analog input signal what are the modifications I need to make to suit my requirement. Can you please help?

Thanks

RE: DC motor Load indicator

shabaz — Thu, 30 Sep 2021 23:39:47 GMT

Hi Manoj,

Measuring current should meet your primary requirement, but also isn't the current related to speed? I think it's a linear relationship when the load is applied, you'll see the current increase almost linearly as the motor is loaded. At least for DC motors, I don't know what you're using.

You'll get a ton of insight by measuring the current but for sure you could measure other things like actual RPM if you wanted to, but it's not as directly related to protecting your motor as a straightforward current measurement (or even a fuse - consider a resettable fuse). Also you mention connection wiring burning, that really needs replacing with more suitable wire.. It's a fire hazard if the wire cannot support the maximum load or has flammable insulation.

RE: XY-FZ35 - Inexpensive Electronic Load

shabaz — Thu, 30 Sep 2021 17:05:12 GMT

Hi Frank,

Great investigation and photos! It's always impressive how much can be obtained for little outlay.. although it has its limitations but maybe it's useful for battery discharging/battery performance measurement (i.e. LiPo or something, where it wouldn't require to discharge to low voltages).

RE: XY-FZ35 - Inexpensive Electronic Load

genebren — Thu, 30 Sep 2021 15:54:26 GMT

Great Blog Frank!

This is an interesting device and it nice to see that you were able to get the serial interface to work. This could be handy device for testing, but I really would need higher current range for my immediate needs.

Well done!

RE: DC motor Load indicator

rsjawale24 — Thu, 30 Sep 2021 15:38:34 GMT

Maybe you can attach an ammeter and measure the current through the motor. High load means high power and higher current will be drawn by the motor.

RE: XY-FZ35 - Inexpensive Electronic Load

dougw — Thu, 30 Sep 2021 15:33:12 GMT

Decent price. Thanks for posting your findings. It seems viable for quite a few applications and it is useful in the sense that I would usually be reluctant to spend more for a test load. I have spent more than this making variable test loads for USB power supplies.

If someone wants to get ambitious they could capture the step response.

RE: XY-FZ35 - Inexpensive Electronic Load

scottiebabe — Thu, 30 Sep 2021 12:35:11 GMT

That is a really nice find.

This will always be the case using a Darlington pass element, it will saturate at 1Vbe + 1Vce sat approximately 1V at moderate currents. You could replace the TIP122 with a logic level NFET (though running them in saturation isn't ideal).

One could replace the current shunt with a higher value resistor, but then the display current would be off by the same factor inversed.

Looks like a basic lm324 constant current source.

Is the fan temperature controlled?

RE: XY-FZ35 - Inexpensive Electronic Load

rsjawale24 — Thu, 30 Sep 2021 10:22:28 GMT

I did try to make one. But often the DIY one costs much more than these inexpensive Chinese electronic items.

For example, recently I was looking for a SMD practice board on Banggood. Later, I thought why not to make a PCB myself? You can get 5 PCBs for 2USD from JLCPCB.

But when I calculated the shipping it was around 27 USD (Fedex) to India (Add 10 USD more for customs). Then buying 30 pcs each of SMD caps (0402,0603,0805), resistors (0402,0603,0805) and SOT packages, cost me around 300 INR ~ 4 USD

DIY Cost = 2 + 27 + 10 + 4 = 43 USD

SMD board (with Components from banggood) = 500 INR + 200 INR shipping (direct mail) = 700 INR ~ 9.43 USD

RE: XY-FZ35 - Inexpensive Electronic Load

Andrew J — Thu, 30 Sep 2021 08:58:47 GMT

Worth $18 for the LCD, rotary encoder(?) and knob. I’m sure the case would be useful too. The DC load function is a nice freebie. I’m pretty sure you could develop your project to fit in that case and have a better test instrument.