Able to get the responses from gps qucetel L89 module through uart .
How to stop the responses continuously from gps L89 module through uart and single command to receive the latitude and longitude parameters?
$PSTMCFGMSGL,<listid>,<rate>,<listlow>,<listhigh><cr><lf>
This is the command that can stop all the messages depending on the setting of listlow and listhigh which is given in the datasheet google for L89 quetel protocol specification.
You can control at what rate the data can be send .
Related
I'm working on a BMS project for an electric car. I'm using LTC6804-2 for voltage and temperature measurement in each cells. As a first step of development, I would like to establish a successful communication with the monitoring IC (LTC6804-2). So, I'm sending set config register command and trying to read back the config register values that I have written. If I receive the configuration register values without a CRC error, I consider my communication as successful.
In my case, I do not receive expected register values with proper CRC when I read back. Let me break down my situation into small segments.
I'm working on a custom BMS board for this project(LTC6804-2 and STM32F072). I will attach the schematics below. To test my code, I tested my program with DC1942C demo board and arduino UNO. And it is working fine. I can read back the config register and I can calculate the cell voltage and Auxiliary values.
When I try to implement the same program in my custom BMS board, I'm not getting the correct values. I always get CRC error in the received data.
Following the guidelines from the Analog Devices forum, I tested the Vref2 value after sending the config register command, and the voltage goes up to ~3V as expected. So the IC is receiving the message properly. But Why it is not transmitting back?
Below are the captures from the demo board and BMS custom board.
Register read capture from Arduino Uno and demo board DC1942C
Register read capture from the custom board
In fact I tested the program with STM32 development board and DC1942 demo board, I get the correct values.
Thank you for your help. If you want any additional details, please let me know.
LTC6810-2 datasheet
I am working on interfacing of SIM7600E-H (A GPS + LTE Module) with Arduino UNO over UART using AT Commands. The high-level plan is to acquire longitude and latitude using IZAT feature and transmit them over LTE to data-server.
Development Board: Arduino UNO with UART using <SoftwareSerial.h>
First, I am getting GPS data using IZAT GPS feature, the acquired data is then bifurcated to get actual longitude and latitude position. Then, creating a data-string comprises POST request and acquired longitude & latitude data. The data-string is of 217 bytes. This data-string is then transferred to SIM7600E-H using command AT+CIPSEND and a terminator - 0x1A. Now, as per AT command set manual, +CIPSEND command should return the received bytes, but it is acknowledging with 0,2,2 instead of 0,217,217. Now, If we follow the same steps for Standalone GPS instead of IZAT GPS then we are getting successful acknowledgment with 0,217,217 and data is also getting posted on data-server.
Further tested, with IZAT GPS feature enabled, I found out that I am able to transmit around 150 bytes only, when using +CIPSEND command. If I am adding some more bytes then it is again acknowledging with 0,2,2.
Prior doubt was if <SoftwareSerial.h> is creating this problem or not?
So, I tried with <AltSoftSerial.h> and even with Hardware serial on DIO 0 & 1. But problem still persists.
So, I facing this kind of issue with +CIPSEND command when enabling IZAT GPS feature.
Serial monitor outputs when using IZAT GPS and Standalone GPS separately:
I have a relay contact closure event that needs to be timestamped accurately ( 1 msec) with a GPS and the PPS output... I am not sure how to feed the relay contact output to a microcontroller and then synchronize the microcontroller clock to the GPS ...plus how to get the UTC afterall?
Can you please help me.
thanks
If your microcontroller has at least two interrupts based on hardware pins, you could connect the relay to one of the interrupt-generating pins, and the PPS to the other interrupt-generating pin.
You will need to connect the NMEA (or other proprietary protocol of your GPS) to the corresponding port in your microcontroller. Some common buses are UART or SIP.
Then, every time that you get a PPS interrupt, you enable a global flag that can be used in the main loop to reset a counter. This counter will tell you how far apart from the PPS the relay switched (if it happens within that second). If you know the base frequency of your counter, you can convert the counter into fractions of seconds. Note that if both edges of the relay state change have to be detected, you will need an interrupt source capable to interrupt on both edges (or use two interrupts)
Then, if the Relay interrupt goes off, you can get the value of the counter upon interrupt, and save it in storage, send it to host, etc. (Note, it would be best to save the value in RAM, lift a flag of "value present", and leave the sending/storing to the main loop, then turning off the flag).
Finally, when you receive a complete NMEA message (this could be being parsed in your main loop by a state machine for instance), you can send this information to the host or storage along with the counter that you saved to time your relay state change. Note please that the NMEA message will be generated and decoded with a certain delay from the PPS, so you will need to compensate for that.
i am doing a project which takes gps cordinates from the gps module and send sms of those locations through gsm module for preset numbers . But , i want to upgrade this. I want to send the name of that location through sms after gathering the gps co-ordinates value . How to do this ? Is there a need of setting up the database to match the co-ordinates ? I am new to these things
A service to map coordinates to place names is called a "reverse geocoder". For example, see this API reference for Android: http://developer.android.com/reference/android/location/Geocoder.html
You may need an active Internet connection for this service to work, however.
Folks
I am using ORG447x to obtain GPS fixes.
Whenever I power up my GPS module
Only response I get is
$PSRF150,1,*3E
Even if I have to write a series of input messages
"$PSRF103,01,00,01,01*24" --> Query rate for GGL message
"$PSRF100,1,4800,8,1,0*0E" --> setting serial port
I have never got any GGL output messages.
Is there any specific initialization routine I need to follow after powering up my GPS module?
Any tips or pointers appreciated
Thanks
AK