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This is the latest version of our Venus GPS board; the smallest, most powerful, and most versatile GPS receiver we carry. It’s based on the Venus638FLPx, the successor to the Venus634LPx. The Venus638FLPx outputs standard NMEA-0183 or SkyTraq Binary sentences at a default rate of 9600bps (adjustable to 115200bps), with update rates up to 20Hz! The Venus638FLPx also allows for limited on-chip logging (check out the firmware below), as well as external logging using a SPI flash memory chip (not included). This board includes a SMA connector to attach an external antenna, headers for 3.3V serial data, NAV (lock) indication, Pulse-Per-Second output, and external Flash support. We’ve also provided solder jumpers to easily configure the power consumption, boot memory, and backup supply. This board requires a regulated 3.3V supply to operate; at full power the board uses up to 90mA, at reduced power it requires up to 60mA.
We’ve made it easy to connect an external battery or super capacitor to the board, to support very fast restarts after power is removed. Not sure which GPS module is right for you? Check out our!
Note: We’ve broken out the pins for the Venus638FLPx’s second serial port (RX1,TX1) and I2C interface (SDA,SCL). However, these ports are not used by the stock firmware. SkyTraq offers an SDK allowing the creation of customized firmware; contact them for details. Hello, I’m currently working on implementing this board into a high altitude balloon for studying the eclipse later this year, and after some testing and stuff I realized I really liked the capabilities of the board, but was annoyed at lotsa libraries size and complexity in use and reading when for the most part, I’m just logging the data to an SD card for analysis later.
So I decided I’d try making my own library for this board. Since the binary commands are relatively simple and can also be read using the configuration software and an arduino to watch the commands being sent, I thought I’d be able to implement a library that can change the settings using functions, which would mean the board could be configured more easily through code in your setup function rather than needing to permanently change settings through the configuration software. I didn’t like the idea of the permanent setting changes because in my experience some setting combinations like 20Hz at 9600 baud would totally mess up the data and make it unreadable, so making sure all saves are temporary prevents this headache that I experienced. Anyway, it’s a work in progress that I’ll be updating more over the next few days to finish all the features I need and adding more examples and images for wiring since I could see how a newer person could get mixed up at a lot of points with this board. It would be such a shame for the learning curve to prevent a newbie from using such a cool board. Check the page every couple days for updates.
This lib works trough a readLine, getLine, printLine kinda workflow. It has a filter so if you wanna record all the GPS data, you can set that to raw, and if you ONLY want GGA or RMC, you can turn on the filter and only get that. And if you don’t wanna record the whole line of GGA, but only the latitude, longitude and altitude, I’ve implemented the same field parser from the tutorial, so you can easily extract a particular field within the GGA sentence since it follows the NMEA standard.
I don’t have the stuff for changing the GPS settings itself yet, but like I said. That’s coming soon. And I’ll also probably add examples for logging to an sd card as well since I saw that asked somehwere.
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Hope this helps someone. I received yesterday this module and also bought an active magnetic sma antenna.
I get the GPRMC data successfully on arduino + digole i2c screen, and fast signal lock, but i have the following issues: 1. The lat-lon position is somewhat off by 30 kilometers. It is showing steady position, but wrong 2.
The time is wrong (-3 hours), should i add 3 hours in general as i am in gmt+2? The data seems to have a delay. The speed for example goes zero after 3-4 seconds after i stop with the car. The other data stabilize also after 4-5 seconds. I read that the lat-long numbers can never go actually to 10-20hz update, you get 20hz data but the numbers change at 1hz, is that true?
I am still new to this, i suppose i need to do some serial connection to pc and do some firmware configuration/settings? All i want is fast (10hz+) lat/long updates for a trackday app i am making. I will answer myself here. I managed to get 20hz updates unpinned, using information from people here (earlier messages). Best way:. one use arduino mega with 4 hardware serial ports, tx0 is usb, connect venus to tx1/rx1. one download a serial pass through program to the arduino (before wiring the tx1/rx1 pins to the venus.), starting with 115200 for tx0, 9600 for tx1.
now on serial monitor 115200 speed you should see the data. open GPS tool from here, connect to arduino port with 115200 speed, configure to read only 1 NMEA message series (example, GPRMC only 1).
then set serial speed to 115200. close GPS tool, download a new arduino program this time with both serial speeds 115200. test with serial monitor, you should get 1hz messages 1 line with 115200 speed.
now open again GPS tool, set update rate to 20hz, done. Perhaps it works with all message series as well, i didnt try. Great GPS Module BUT ONE Problem. The Venus GPS board has no carrier to make it easier to integrate. So, I modified an older USB Adapter for XBEE, the XBee Explorer USB WRL-08687.
The inside hole pattern is just right for the Venus board. If you turn the module around so that the RF antenna connector is pointed the same way as the USB connector, and move it to the far end of the hole pattern, it works perfect. You get Ground, 3.3V, DOUT (Tx0) and DIN (Rx0) right where you want it. I used (2) 4-pin and (2) 3-pin socket connectors and separated them one hole to isolate RTS and DIO12.
That way CTS, RTS and DTR are not connected from the USB chip to the Venus. It works great for USB connectivity. ——————– Tech Support Tips/Troubleshooting/Common Issues ——————– High Altitude Balloon Projects The Venus GPS is good for High Altitude Balloon projects.
It was recommended by one of our engineers that launched a HAB. Under page 3 of the datasheet , it states that the GPS receiver is able to achieve an altitude higher than 18,000 meters if it is not past a speed of 515m/s. Exceeding both limits at the same time will disable the receiver. This is so that the part cannot be used in a rocket or missile under the CoCom limits. After some poking around with this board, I have found some quirks and bugs I’d like to share:.
The 20Hz feature is of limited use. With 100ms apart, two packets arrive back to back with absolute zero space between. This means the first in each pair is at least 50ms late. If you configure it for 10Hz, packets are properly spaced 100ms apart. This quirk is true for both NMEA and binary. GGA is the only message that is sent faster than 1Hz.
All other NMEA types are sent at 1Hz, regardless what update rate you configure. SkyTraq’s current document Binary Command Set totally skips the navigational output format, it only handles the binary input config messages.
I had to dig long and deep to find an earlier version (1.10) that explains the format of the 0xA8 message. Highly recommended; it’s more efficient in that it has all the greatest hits, all wrapped up into one packet. Some users on the forum has complained about a static looking nav solution, where not even the least significant digit moves in lat/lon. No GPS is that good! It bothered me too, until I found the fix. SkyTraq calls it “pinning”, and is the threshold in position and velocity change that must occur before it’s reported as such.
By default this feature is turned off (message 0x39 turns it on/off). However, the pinning parameters must also be zeroed out, even if the feature is disabled! Use message 0x3B and set all to zero. Now you will see the normal “random” drift. You may also want to check out message 0x3C and set car or pedestrian dynamics, for optimal filtering. The 20Hz positions are accurate in that the position data corresponds to the location at the specific time given, however the messages will be delayed (sometimes over 200mS) from the PPS output.
If you need to correlate some other event, use the PPS. (On my motorcycle logger, I reset a millisecond counter using PPS and mS-stamp the engine messages). RMC, GLL, GGA, VTG are all sent at the 20Hz or other value but can be throttled with another setting. The satellite status (GSV/GSA) is sent at 1Hz. I have a preliminary opensource set/get program at github.com/tz1/skytraq which can fetch AGPS, upload it, and set many of the parameters, but it is a work in progress.
Hey, for some reason they took the binary navigation output (ID: 0xA8) message out of the Binary Command Set documentation. This message can be found in the version 1.10 of the document on this page: (accessed from the GPS-09133 product). Since this is arguable the most important message, it is strange why it would be removed from the documentation. Others may find this very useful, as it was VERY IMPORTANT to me, maybe you (sparkfun) could make a note and provide a link. I though this awesome GPS module was retired!, is good to know there’s a new, improved product.
I have my own (old version), working at 115200bps and 1Hz samplig rate for testing. O wrote a routine that can send commands into the unit.
I send a restart command into the module, the module “should” send me back an ACK message, but, i get a completely diferent message from the especified in datasheet (same size of ACK, NACK, but 2 or 3 bytes different). Does anybody have made applications like mine, that could help me? In my opinion, this module is simply awesome and cheap ($60 with shipping to Colombia). I can get 3D fix positions inside my house, away from windows or doors.
The only thing you should take care is the antenna. GPS-00177 antenna tends to brake in place where cable gets into the shield. Some epoxy fix that “issue”. Hi I have a couple questions that don’t seem to be explained here. 1) How is the firmware updated/changed? 2) whats the difference between the firmware versions posted. From what I can guess the standard version will log to SPI still.
The internal logging logs to the internal flash. But what does “high dynamic range” really mean in this context? And how do you define a sharply turning vehicle? 3) what is the difference between booting from FLASH and ROM? Is there a different “standard” version that is non-erasable? If so what does the rom firmware do differently?
1) The firmware is updated via the “GPS viewer / configuration software” linked above. Towards the bottom of the window is a “download” area with a “” button to select the firmware file. Click the blue button to update. It’s not a bug in the arduino. Ints in avrgcc are 16bits. 38400 in binary is 1001 0110 0000 0000. Note the overflow into the sign bit!
So the const int baud really has the decimal value -27136. When you use that to call begin it gets cast to a long but retains the negative value (which is the correct behavior). If you want to use a const instead of a literal value, you can define it as a const long and you should be okay.
If you do use a literal value writing it as 38400L is best because you’re explicit about the type. Note that literal values are, by default, interpreted as ints! Here you are lucky with Serial.begin(38400) working at all because the compiler can figure out from context that you meant 38400 to be a long!
Hi there, i’m writing you to understand something: 1i need a gps to realize a wearable device, i just bought this one and i would like to be sure about which kind of configuration (in your opinion) i should use for have battery saving and good performances. To be more precise, i will use this for sport activity. 2i would be grateful if some of you have some arduino sketch (or better an discovery ST program) to drive such GPS. It would be very fast for me to implement and run the GPS 3the better way to connect it to have the best performance from it and battery savings at the same time. Thank a lot folks rik. This GPS receiver will use about 100mA while it’s acquiring a lock after it’s turned on, and about 50mA after that. You can switch to a lower power mode by changing the “PSE” solder jumper from H to L; this turns off some of the channels.
The trade is that it will take longer to acquire lock. There aren’t many other things you can do to lower power consumption besides keeping the update rate as low as possible.
(You can set this in the “GPS viewer / configuration software” linked above.). For example code take a look at the library. It’s the most popular and easy-to-use GPS library and like most Arduino libraries it comes with examples that explain how to use it. Hi I just purchased this GPS module and I can not configure at all. I would like to update it update rate but am unable to. I have been using the standard code found on Simon Monk’s site to view GPS messages at 1Hz.
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But I am unable to use the SkyTrack GPS software for anything other than reading. When I try to update any settings on the Venus chip I get an error saying “Target doesn’t replay please power cycle target”. Am I missing a serial command so that the software can communicate with the GPS chip? I’m pretty new at using Arduinos, I apologize if this is a simple question.