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Forum Index : Microcontroller and PC projects : V.KEL VK16HX GPS MODULE
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palcal Guru Joined: 12/10/2011 Location: AustraliaPosts: 1802 |
V.KEL VK16HX I just bought one of these on E-BAY for $12. I have got it working OK by only connecting VCC, GND, and TX. It has 6 pins, they are marked VCC_N, GND, RX, TX, VCC, BOOT I suspect this is incorrect, I think BOOT should be PPS. Can some one tell me what VCC_N is. I suspect it is ENABLE and would be connected to VCC. Paul. "It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all" |
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jman Guru Joined: 12/06/2011 Location: New ZealandPosts: 711 |
Hi Paul Take a look here https://www.youtube.com/watch?v=o5cdIFSfk3g Video Regards Jman |
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palcal Guru Joined: 12/10/2011 Location: AustraliaPosts: 1802 |
Yes I saw that. He has the pin VCC_N marked as BOOT, but if you look at his connections it is not connected. I just want to know whether to leave it floating or tie it high. Paul "It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all" |
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jman Guru Joined: 12/06/2011 Location: New ZealandPosts: 711 |
Hi Paul Here you go VCC_N This is for enabling the uBlox module. This pin should be connected to GND or left floating for the module to be ON. If this pin is connected to the VCC, then the module will be turned OFF. This is useful to save power, i.e. once you have obtained a fix, you can turn OFF the power to the GPS module. from here http://www.embeddedgyan.com/ubuntu/ubuntu-using-a-gps-dongle / Regards Jman |
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palcal Guru Joined: 12/10/2011 Location: AustraliaPosts: 1802 |
Thanks Jman Paul Edit. Will give this a field test tomorrow and report on its accuracy. "It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all" |
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Geoffg Guru Joined: 06/06/2011 Location: AustraliaPosts: 3165 |
Good grief, $12.03 for a complete GPS module with antenna! How cheap can these things get? There are masses of electronics in there. For a start there is a 24 channel receiver (that is 24 simultaneous channels) at 1.5GHz. Then it can track up to a dozen satellites at one time. Each satellite transmits its orbital parameters in the signal so the module has to continuously work out the 3D orbit of each satellite and then use the time difference between all of them to calculate your location on the 3D surface of the earth. And while doing that it has to compensate (using Einstein's theory of relativity) for the lesser gravitation up there (time is faster) and the orbital speed of the satellites relative to us (makes time run slower). All for $12.03 Amazing. Geoff Graham - http://geoffg.net |
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viscomjim Guru Joined: 08/01/2014 Location: United StatesPosts: 925 |
It kind of make me understand how the heck they can make this thing for the price that they do. GPS, GSM, GPRS, plus ucontroller, case, antennas, etc.... JEEEEZ Would really like to know how your testing went. I would like to get my hands on one if it works well for you... let us know... |
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palcal Guru Joined: 12/10/2011 Location: AustraliaPosts: 1802 |
I tested this afternoon against an EM-408 module that seems to be very accurate (usually within 1 or 2 metres). I tested on the golf course with distances up to 500 metres. At times it read exactly the same and at other times was up to 10 metres different. Seemed accurate when travelling North but a bit out when going the opposite way but for $12.98 it is accurate enough for my purpose. I would probably favour the EM-408 but can't buy the TTL version any more which means I have to convert the signal. Will test again tomorrow. Paul. Edit Gave it another run this morning and it performed much better, no more than 2 metres different to the EM-408. This is something I have noticed before with the EM-408, that accuracy changes with the time of day. Must have something to do with the satellites. Paul. "It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all" |
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viscomjim Guru Joined: 08/01/2014 Location: United StatesPosts: 925 |
@palcal, can you tell me if you tried to use this unit indoors or not, and if so, did you get enough signal to pull the time stamp? Thanks!!! |
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palcal Guru Joined: 12/10/2011 Location: AustraliaPosts: 1802 |
No I have not tried it with only the time. But I will this weekend and let you know. Paul. "It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all" |
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viscomjim Guru Joined: 08/01/2014 Location: United StatesPosts: 925 |
I thank you in advance!!! |
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palcal Guru Joined: 12/10/2011 Location: AustraliaPosts: 1802 |
Jim, I tested in my workshop that has metal roof and it seems to work OK. It has a red LED for power and a green LED that starts flashing at 1PPS when it gets a fix. Don't forget when programming it is 9600 baud. Paul. "It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all" |
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