I was trying to change the baudrate of the sensor and it stopped working
Hi, I was trying to work with the MTi 610 IMU. I had installed the software suite from MTi, and as I was playing with it, I changed the baud rate to increase the frequency of the data output.
Initially I had changed the baud rate to 921600, and I was able to get the output from the sensor to increase to 400 Hz. However when I tried to increase it to 2000000, (which was an option that was available in the software suite) it couldn't apply the change to the sensor. Furthermore, when I tried restarting the sensor, it would not connect. Has anyone else faced a similar challenge? Any assistance would be appreciated
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I am trying to measure power usage using dds353 kWh meter. This meter has a pulse output. I am interested in using the esp32 since I can periodically send the data over the internet to nodered dashboard.I am also very interested in using the esp32 in low power mode and periodically wake up to send data over mqtt. I have tried out examples from github using espressif idf but I would not mind an arduino equivalent. I would like to do hardware interrupt which when one of the rtc gpio pin goes high a counter is incremented while a seperate timer interrupt run and occasionally wakes up the main xtensia cores which fetches data from the rtc and sends it over. I have looked at the pulse counter examples and with my limited knowledge can not tell if the interrupts are triggered when the ulp is in sleep mode or only when it is on. I would really be glad if someone would show me how to basically use the ulp for counting pulses even when it is sleep mode and periodically wake up the main cores. I am ok with IDF or arduino examples
If you want to count pulses while in deep sleep youuse the ULP. Code on the ULP continues to execute when the board wakes up and goes to normal power mode. So when it is awake, it will still run the counter on the ULP processor unless you stop the ULP periodic wake up timer, ULP will keep waking up and running while the main CPU is active.
As you gave already checked with this example , it should be pretty close to what you need. The only difference seems to be that the example is set to wake up after a given number of pulses, rather than a fixed amount of time. However it should be easy to change that, by enabling deep sleep wake up from timer.For the Arduino you could check Some additional info:
ULP doesn't have GPIO interrupts. So you use deep sleep wake stub (small piece of code which runs immediately after deep sleep, prior to loading application from flash into RAM) you can increment the pulse counter variable, and go to sleep again. This way you can get low power consumption (~5uA) between pulses and moderate power consumption while running the wake stub (around 13mA), for a very short time.
So its up to you to experiment with your specific scenario.
You can use Pulse Counter(PCNT) feature in ESP32 to count the number of pulse in background, Understanding by using same you can able to do some periodic wake-up and read the count.. Its also possible to configure event when number of counts reached certain threshold and had lot of options,
For get information and available Interfaces and API's for Pulse Counter(PCNT) please follow below link, https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/peripherals/pcnt.html
Initially I faced lot of issue to make Pulse Counter(PCNT) work in Adrino IDE for ESP-32, After multiple attempt I make it working, And same sample code is uploaded in GitHub for reference. I have not use all the API's in the official documentation but but used few of them and are working..
I have created sample program for a water flow meter, there also we use to get pulse which needs to count to measure the water flow rate, understanding simile to kWh meter.
GitHub Sample code Path:- https://github.com/Embedded-Linux-Developement/Arduino_Sample_Programs/tree/main/ESP_32/Water_Flow_Pulse_counter_WithOut_Interrupt_Using_PCNT
I have not placing the code here, because its there in GitHub and not directly for the asked question, but simile one and can use it. Its a working code I tested in HW.
Hopes Its helpful,
Regards, Jerry James
I am using 6 different sensors which are working simultaneously, but I got a problem in the readings from LM35 temperature sensor and MQ-7 Carbon Monoxide sensor. The values are changing depending on the power source.
How can I fix this problem? I'm planning to use a Sony power bank to feed my system but I am getting the wrong values especially from the temperature sensor.
Make sure that your power source is stable and continuous (i.e. make sure that your power bank is working fine and check its current output if its compatible with Arduino)
Make sure that your sensors are wired correct and working fine, try with different LM35 and MQ-7 sensors, if you have that chance.
Make sure that you are supplying your circuit with correct voltage and current, sensors may work unstable if you are supplying them directly from Arduino pins (because maximum current limit of the pins onboard may not be enough for your circuit), try an external power source such as MB102 power module.
Although, it's not a coding problem my suggestion is you can use signal conditioning to solved this. Search about low pass filter and high pass filter to filtering frequency in output sensor.
The simple method is using voltage divider, like this:
Vout = (R1/R1+R2) * Vin
R1 is your sensor, and R2 is resistor.
Well I've looked and looked and just cant find data on the max current of the 5 v output (or even a suggested reasonable max)
They all mention 50 mA for the 3.3v output.
Looking at the chip it's a smaller board than the Arduino Uno so I don't want to pop it.
I assume someone will know the max current that the regulator on this board can handle and surmise what the 5v current out could be? Thanks in advance!
EDIT: The regulator / board 5v pin out, not chip related.
EDIT: Assuming supply is from the 12v power adapter.
The schematic shows a NCP1117ST50T3G. The datasheet shows 1500mA (typical).
Note that you may not actually be able to draw that at the higher end of the input voltage range since the Arduino may not provide sufficient heatsinking, needed since the regulator will shut down if it gets too hot (and the regulator will melt down if it doesn't shut down).
Also note that the traces on the board may not be designed to allow that much current to flow safely, and you could end up damaging the board itself regardless.
I'm going on record that you can put any amperage as input as long as the voltage in within range. So, if you have a 5V 200A high power input you are still fine. Now, If you have a short, you're cooked. But a properly designed circuit will draw what it needs and nothing more.
Hyperbole. I know absolutely nothing about this topic. I'm hoping a lot of people will call me names and one of those will correct me with a correct electrical engineering based answer. Either my view is correct or it isn't.
In MATLAB, I am establishing a serial link to an Arduino. Is a higher baud rate always better? I am using 9,600 baud now, but that is merely because it is the most standard value.
You'll have better luck over at https://arduino.stackexchange.com/.
Why do people settle?
People settle because it is more than fast enough. The most common use is just to print some stuff on a terminal
for debuggin. 9600 baud is 960 characters per second, or 12 x 80
character lines per second. How fast can you read? :)
If your program is using the serial port for bulk data transfer, you
would choose not to settle.
See the following resources:
Serial.begin(): Why not always use 28800?
How high of a baud rate can I go (without errors)?
Good question. I've spent years working with modems and I'm not stranger to baud rates. My Arduino uses a USB connection and it handles the baud rate, so I never got into messing with it.
It's strictly how quickly do you want your program loaded. It has no other effect. It would be reasonable to consider that low-end equipment might not support the higher end speed. From the communications perspective, the higher the baud rate the more chance of data errors. I think it's a stretch to think the communications between the pc and an Arduino is going to have much of an issue.
I am using the TinyGPS library and am trying to display information to get to a specific latitude/longitude via an LCD screen.
I am not getting any data. The output of directionto is "broke" and distanceto and bearingto is 0.
Code redacted
And here is what my pins/hardware look like: http://i.imgur.com/7iDBwxm.jpg
I am using an Arduino Uno, LCD shield and GPS shield by ITead Studio.
I am hoping it is either the pins or not having a GPS signal.
Reddit post: Arduino TinyGPS help
The baud rate for SoftSerial should be 9600.
You need to debug the system step by step to understand where the problem is.
I would start using only the serial monitor and no display.
Please note that when you switch on a GPS that has been moved for several hundred km, and the same is when you switch it on for the first time, may take a while to get the satellites and start giving out some data. Make sure you are in a open area and wait for 5 to 10 minutes before you declare it as "not working". The next time you will switch it on will be much quicker.
I have checked the documentation of your shield and what they also say is to make sure the Micro SD card you use is support SPI mode but not just the SD mode, also don’t forget to format it into FAT16 , and add a “datalog.txt” file on your card for Arduino to log the information.
Try that and then read the data on the sd card to make sure that is logging.
Come back with the outcome of the above tests and we will try to support you further.