Grove-GPS can't work

yiwen · March 16, 2016, 1:13am

Hello
My raspberry pi is Raspberry Pi Rev 2 Model B 512MB made in UK.
Use GrovrPi not grovepi+.
I try to use them with Grove – GPS. And I run the program which copy form http://www.seeedstudio.com/wiki/Grove_-_GPS.
But it can’t work. The Error message follow the picture.
Please tell how can I do.

Yiwen

JohnC · March 20, 2016, 4:45am

Hi Yiwen, Karan just updated the GrovePi directory with this example yesterday. Can you take another look and update the software?

github.com

DexterInd/GrovePi/blob/master/Software/Python/grove_gps/README.md

GrovePi Examples for using the [Grove GPS Module](http://www.seeedstudio.com/depot/Grove-GPS-p-959.html?cPath=25_130)

*Files*:
- grove_gps_hardware_test.py : This example is for is the simplest GPS Script.  It simply reads the raw output of the GPS sensor on the GoPiGo or GrovePi and prints it. 
- grove_gps_data.py : Reads and parses the data for individual elements like the lat, long and other variables
- GroveGPS.py is the basic library from Seeed
- dextergps.py is the newest library. The challenge with GPS data is parsing the incoming data to get appropriate valid information out of it. dextergps.py uses regular expressions to ensure data validity and is quite simple to use:
```python
	gps = GROVEGPS()
	while True:
		time.sleep(1)
		in_data = gps.read()
		if in_data != []:
			print in_data
      print gps.lat, gps.NS, gps.lon,gps.EW
      print gps.latitude, gps.longitude
```

**gps.lat** and **gps.NS** go hand in hand, so do **gps.lon** and **gps.EW**

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yiwen · March 22, 2016, 1:13am

Hello
this picture is my result.
it finally can work ,but the value is strange.
Some value is empty.
Can you teach me how can I do .

Thanks

Yiwen

JohnC · March 22, 2016, 1:38am

It’s working: you’re getting a date and time. You just haven’t connected to any satellites yet. You should take it outside to connect to satellites.

yiwen · March 26, 2016, 2:00am

Hello
I had tried to move the GPS sensor outside.
But it still is’t any change .
The result like the picture which I gave you last time.

JohnC · March 27, 2016, 11:27am

Hi yiwen, how long did you lave the GPS sensor outside? How much of the sky could it see? It sounds like you’re not giving it enough time to acquire satellites. It can take seconds or minutes, with an open sky, to get satellite signals for a GPS.

yiwen · May 2, 2016, 2:34am

Hello
I follow your directive to do.
But the result like the picture which I gave you last time.

JohnC · May 3, 2016, 12:34am

Sorry to hear that Yiwen. This is definitely a problem with the sensor, I would contact the company you bought it from and ask for a replacement.

yiwen · May 10, 2016, 12:15am

I discover that i run the program ir_receiver_check.py
the result is false
is the program right?

yiwen · May 10, 2016, 12:16am

import subprocess
debug =0
def send_command(bashCommand):
process = subprocess.Popen(bashCommand.split(), stdout=subprocess.PIPE) #, stderr=subprocess.PIPE)
output = process.communicate()[0]
return output

def check_ir():
flag=0
if ‘lirc_dev’ in open(’/etc/modules’).read():
flag=1
if debug:
print “lirc_dev in /etc/modules”

if 'lirc_rpi gpio_in_pin=15' in open('/etc/modules').read():
	flag=1
	if debug:
		print "lirc_rpi gpio_in_pin=15 in /etc/modules"
		
if 'lirc_rpi gpio_in_pin=14' in open('/etc/modules').read():
	flag=1
	if debug:
		print "lirc_rpi gpio_in_pin=14 in /etc/modules"
	
if 'dtoverlay=lirc-rpi,gpio_in_pin=14' in open('/boot/config.txt').read():
	flag=1
	if debug:
		print "dtoverlay=lirc-rpi,gpio_in_pin=14 in /boot/config.txt"
		
if 'dtoverlay=lirc-rpi,gpio_in_pin=15' in open('/boot/config.txt').read():
	flag=1
	if debug:
		print "dtoverlay=lirc-rpi,gpio_in_pin=15 in /boot/config.txt"
		
if flag:
	return True
return False

def replace_in_file(filename,replace_from,replace_to):
f = open(filename,‘r’)
filedata = f.read()
f.close()

newdata = filedata.replace(replace_from,replace_to)

f = open(filename,'w')
f.write(newdata)
f.close()

def disable_ir():
if check_ir()==True:
if debug:
print “Disabling IR"
replace_in_file(’/etc/modules’,“lirc_dev”,”")
replace_in_file(’/etc/modules’,“lirc_rpi gpio_in_pin=15”,"")
replace_in_file(’/etc/modules’,“lirc_rpi gpio_in_pin=14”,"")
replace_in_file(’/boot/config.txt’,“dtoverlay=lirc-rpi,gpio_in_pin=14”,"")
replace_in_file(’/boot/config.txt’,“dtoverlay=lirc-rpi,gpio_in_pin=15”,"")
else:
if debug:
print “IR already disabled”

def enable_ir():
if ‘lirc_dev’ in open(’/etc/modules’).read():
if debug:
print "lirc_dev already in /etc/modules"
else:
if debug:
print “lirc_dev added”

	with open('/etc/modules', 'a') as file:
		file.write('lirc_dev\n')
		
if 'lirc_rpi gpio_in_pin=15' in open('/etc/modules').read():
	if debug:
		print "lirc_rpi gpio_in_pin=15 already in /etc/modules"
else:
	if debug:
		print "lirc_rpi gpio_in_pin=15 added"
		
	with open('/etc/modules', 'a') as file:
		file.write('lirc_rpi gpio_in_pin=15\n')

if 'dtoverlay=lirc-rpi,gpio_in_pin=15' in open('/boot/config.txt').read():
	if debug:
		print "dtoverlay=lirc-rpi,gpio_in_pin=15 already in /boot/config.txt"
else:
	if debug:
		print "dtoverlay=lirc-rpi,gpio_in_pin=15 added"
		
	with open('/boot/config.txt', 'a') as file:
		file.write('dtoverlay=lirc-rpi,gpio_in_pin=15\n')

if name == “main”:
print check_ir()
#disable_ir()
#enable_ir()

yiwen · May 10, 2016, 12:33am

https://drive.google.com/file/d/0B4d_j5X02MGjcXFfdzFlS1JYWUE/view
This is ir_receiver_check.py .

karan · May 10, 2016, 3:39am

Hi yiwen,
The program ir_receiver_check.py would return false if the IR receiver is not enabled and that should be the default behavior. Are you having any problems with that.

-Karan

yiwen · May 11, 2016, 11:15am

Hello ,

Do I need ir_receiver_check.py when I run those program “https://github.com/DexterInd/GrovePi/blob/master/Software/Python/grove_gps/README.md” ?
There isn’t ir_receiver_check.py in the source .
When I run it,it will be error “can’t find ir_receiver_check.py”.
Than I download one which I gave last time,but I forget which web I download it.
But now error is “Disable IR receiver before continuing”.
I still don’t know the real problem.
I have some questions.
Whether I need ir_receiver_check.py to run GroveGPS?
If I need it how can I open IR receiver ?
Please help me solve the question.

karan · May 11, 2016, 9:24pm

Hey yiwen,
You can comment Line 54-56 here and it should work for you https://github.com/DexterInd/GrovePi/blob/master/Software/Python/grove_gps/grove_gps_data.py#L54-L56.

-Karan

yiwen · May 12, 2016, 1:27am

Hello,
Should I also comment Line 49 ?
So run the GPS need IR receiver ?
Thanks

karan · May 12, 2016, 10:22pm

Yeah, comment line 49 too. Those lines are there to detect a conflict between the IR receiver and the GPS on our image.

-Karan