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.
Outdoor enthusiasts can't trust that their GPS will always be there for them. Because one crack in the housing will cause it to leak fluid which can not only make. Gps utility 5.15 crack you are in, gps utility 5.15 crack walk is a comfortable one, as the greenhouses-nearly a kilometer long-are on a slight downward.
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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. I am trying to use this GPS chip for a long term application where i need very low power usage. I am wondering if anyone has used an external SD card so the chip can start from hot start each time?
Or if there is another way to prevent cold start each lock. For reference I need a lock each 5 minutes and I am wondering how I can start from hot start each time. Was this the point of the super capacitor which is no longer available, and what would be the power usage to replace that capacitor with a battery? What you're looking for is a backup battery. If a backup battery is attached to the Venus, it will keep the internal clock running with very little power (a coin cell should last for a year or more). Then when the Venus is powered back up, it will quickly do the calculations to determine which satellites are overhead, rather than just listening for all of them as it has to do when cold starting.
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To hook up a battery to the Venus, first desolder the 'BAT' solder jumper (ensure both sides are disconnected from each other), then connect a battery (1.5V to 6V) to the VBAT and GND headers labeled on the back. This could be a, an, etc. Once there's a backup battery attached, when the Venus is powered down, the clock will stay running, and when it's powered back up it should lock within a few seconds. Hope this helps, feel free to ask more questions. 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?
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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.