Search found 27 matches

by rhbroberg
Fri Apr 22, 2016 12:55 am
Forum: RePhone
Topic: (TECH) GPS xadow board battery backup
Replies: 1
Views: 1231

(TECH) GPS xadow board battery backup

The Quectel L70 GPS chip on the xadow board has a pin, V_BCKUP, which is meant to be supplied with a battery to allow the location data to be preserved even during power loss to Vcc (hardware reference diagram mentions a particular coin cell battery). The schematic file URL http://www.seeedstudio.co...
by rhbroberg
Wed Apr 13, 2016 7:49 am
Forum: RePhone
Topic: rephone+GSM+GPS battery lifetime very short
Replies: 1
Views: 2517

(TECH) Re: rephone+GSM+GPS battery lifetime very short

There's more going on than I first realized. The battery level API returns 100, 66, or 33 for values. After my rephone has been running on a fully charged battery, and it shuts off because the battery level is too low after an hour (based on current consumption), and I plug it back in - the battery ...
by rhbroberg
Wed Apr 13, 2016 3:06 am
Forum: RePhone
Topic: rephone+GSM+GPS battery lifetime very short
Replies: 1
Views: 2517

rephone+GSM+GPS battery lifetime very short

With BT off, and GSM on, using the rephone (xadow v2) GPS, and posting to a MQTT server via TCP at one sample per second (with a 200ms blink of green led each send, otherwise led is off), I get about 52 minutes of runtime from the fully charged 520mAh rephone battery which came in the kit. No other ...
by rhbroberg
Wed Apr 13, 2016 2:28 am
Forum: RePhone
Topic: (TECH) limited success with alternate LiPo batteries
Replies: 1
Views: 1380

(TECH) limited success with alternate LiPo batteries

I cannot get an alternative LiPo battery (to the one which came with my rephone kit) to be useful. I have some of these, 1100mAh batteries: http://www.aliexpress.com/item/103040-3-7V-1100mah-Lithium-polymer-Battery-with-Protection-Board-For-GPS-Bluetooth-Digital-Products-Free/1851558937.html which I...
by rhbroberg
Tue Mar 29, 2016 8:13 am
Forum: RePhone
Topic: GPSv2 inaccuracy
Replies: 30
Views: 24407

Re: GPSv2 inaccuracy

Someone needs to make a complete how-to. The problem is that there is flashed code in the xadow gps board and there is no easy way to re-flash it from the existing development environment. I've posted a hex file which fixes both the inaccuracy as well as the race condition. The race condition can be...
by rhbroberg
Tue Mar 08, 2016 12:53 pm
Forum: RePhone
Topic: (TECH) Linkit GSM examples in Eclipse fail for me
Replies: 2
Views: 2271

(TECH) Linkit GSM examples in Eclipse fail for me

I am able to run many of the Linkit Assist 2502 examples in my Eclipse environment for the RePhone. I have the Network_HTTP example working just fine with a SIM card, and I know what my APN settings need to be. Since I can send http GET packets just fine, I know that my SIM card is working with my R...
by rhbroberg
Tue Mar 08, 2016 7:36 am
Forum: RePhone
Topic: GPS V2 dash missing from Longitude
Replies: 2
Views: 1259

Re: GPS V2 Another Issue

if the Longitude is East, you make it negative - that's a standard convention.

Look at the LGPS.get_ew() method, adjust your sign based on that value.
by rhbroberg
Tue Mar 08, 2016 2:29 am
Forum: RePhone
Topic: GPSv2 inaccuracy
Replies: 30
Views: 24407

Re: GPSv2 inaccuracy

I used a Adafruit 8266 Huzzah part. This series of web pages is a great introduction https://learn.adafruit.com/adafruit-huzzah-esp8266-breakout/overview You may want to look at this page in there https://learn.adafruit.com/adafruit-huzzah-esp8266-breakout/using-nodemcu-lua showing the right way to ...
by rhbroberg
Tue Mar 08, 2016 2:24 am
Forum: RePhone
Topic: (TECH) 5x7 LED source code won't build
Replies: 5
Views: 3008

Re: (TECH) 5x7 LED source code won't build

I'm not trying to build the firmware for the 5x7 led array in eclipse in the rephone environment. What I'm trying to do is build a sample application which I can run on a rePhone which controls the 5x7 led array. That's the sample code I'm looking for.
by rhbroberg
Sat Mar 05, 2016 2:28 am
Forum: RePhone
Topic: (TECH) 5x7 LED source code won't build
Replies: 5
Views: 3008

Re: (TECH) 5x7 LED source code won't build

I see the additional zip file attached. That module appears to build the hexfile for the 5x7 array firmware; however what I really need is sample code from the RePhone side which shows how to control the 5x7 array. Can you point me towards that code? Thanks