GM862 Evaluation Board Basic 50-Pin Connections, Help Please

GPS/GNSS Development Boards
1

Hello everyone,

I would like some advice about connecting

SparkFun GM862 Evaluation Board - Basic 50-Pin

without any external microcontroller.

http://www.sparkfun.com/commerce/produc … cts_id=277

In the GM862 Evaluation Board - Basic 50-Pin,

I’m connecting :

-(the four) 3.8V pin, directly with power

(3,8 volts nominal, Min.3,4 volts, Max.4,2 volts,

and 2.5Amper. I’m using LM350T able to supply 3.0A)

-(the two) GND pin, to ground.

-GND/ADC pin, to ground.

what is that for??

then what about…

1)the ON/OFF pin ??

GM862-GPS Hardware User Guide on page 19 of 73 says :

“To turn on the GM862-GPS the pin ON# must be tied low for at least 1 second and then released”

what does “tied low” mean ??

does “tied low” mean connected to the ground??

Can i use a “Momentary Push Button Switch”

connecting the ON/OFF pin to the GROUND

to turn the module on??

Is that correct??

somewhere else in the web i noticed the expression “active low”

what does “active low” mean??

2)STATUS pin ??

I think i have to put a green led with 100R resistor connected to the ground.

and then depending of the status, le led stay on, off, or blinking.

Is that correct??

3)DTR pin??

considering the module is already programmed in python language and already tested

and doing his job pretty well. I don’t need to program it, i just need

the script execuption.

what about this pin??

what should i do with it??

somewhere else i read 2.8 Volts??

should i also supply 2.8 volts??

and just in case, what and when is using 2.8 volts??

Before connecting anything i would appreciate some advice

from who knowns better then me what is doing.

Thanks.Roberto.

2

Read the GM862 documentation thoroughly, it’s all in there.

You need an MCU, of course.

Leon

3

I thought there was no need of external micro controller

to run simple python script.

I had a look at the GM862 documentation.

I believe You, it all there, for experienced people,

but i am just a beginner, asking some help with

some questions.

i tried to describe as best as i can, my situation,

with some specific questions.

Is there anybody there who can give me me some more help?

Thanks.Roberto.

4

How are you going to get the Python code into it? If you don’t want to interface it to an MCU you will have to interface it to a PC.

This sort of project isn’t really suitable for a beginner.

Leon

5

-How are you going to get the Python code into it? If you don’t want to interface it to an MCU you will have to interface it to a PC.

-from my first message :

“considering the module is already programmed in python language and already tested and doing his job pretty well. I don’t need to program it, i just need the script execution.”

Best Regards.Roberto.

6

A Python script is Python code. How will you load it?

Leon

7

I have a problem here, Im trying to test GM862 module but it doesn’t turn on!! I read the manually carefully and did all whats written, the status led blinks for 7 times and then off but then nothing and the module is still off, what can be done to turn it on!!??

8

How are you powering it? It can take up to 3A momentarily when first turned on, and will shut down if it doesn’t get it.

Leon

9

leon_heller:
How are you powering it? It can take up to 3A momentarily when first turned on, and will shut down if it doesn’t get it.

Leon

Thanks for reply and sorry for being late

Well We are connecting a switch to give the circuit a trigger, and we tried connecting a capacitor of 10000uf and 20000uf at the power circuit but nothing changed as well!!

any clue?

10

How much current can your supply deliver? I’ve used the GM863 with my bench supply without any problems, and that has similar requirements to the 862. I did put a 100 uF tantalum by the supply pins, it won’t work without that.

Leon

11

Hi Senner70s,

Did you resolved your problem? Does it power on now?

I have kind of similar problem, only in my case the LED is never light ot bliks :frowning: I thought if you resolved the problem probably you could easily tell me what I am doing wrong.

Here it is what I did:

  • connected VBATT and GND to 3.7 Polymer Lithium Ion Batterie

  • connected pin 39 STAT_LED to LED in series with 100 Om resistor to +3.7 on th batterie

  • touching pin 17 ON/OFF to the GND for few seconds, trying to pull it up for few second and GND after that

I expected pulling up ON/OFF and put it to the GND should power the device so the STAT LED should give me indication of the network status but it is no lighting.

I would appreciate any relevant advice, I am stuck :frowning:

Thanks.