Search found 69 matches

by Azimon
Sat Dec 17, 2011 9:23 am
Forum: GPS
Topic: arbitrary shutdown of GM862-GPS
Replies: 17
Views: 8617

Re: arbitrary shutdown of GM862-GPS

I know this thread is old but I just also wanted to chime in and say that YES, the capacitor has to be very close to the power pins of the GSM module... I also use a L5973D and my 1000uF cap was about 5cm away on the board and it did not work. Only when I wired short 15mm leads to it and connected i...
by Azimon
Fri Dec 16, 2011 9:34 am
Forum: Wireless/RF
Topic: GE864 will not turn on
Replies: 1
Views: 424

GE864 will not turn on

I am trying to turn on the GE864 module but it will not turn on. The configuration is 3.8v (L5793D switcher) and only Tx/Rx are connected. When I give the pulse on ON_OFF the LED turn on for a short while (basically as long as the ON_OFF pulse is there) and then turns off. What could be wrong? I eve...
by Azimon
Mon Oct 10, 2011 4:41 am
Forum: Wireless/RF
Topic: GSM abstraction layer API (for Telit)
Replies: 0
Views: 303

GSM abstraction layer API (for Telit)

Hi. I am new GSM, and am planning to use a Telit module in my project (GE864). I would like to create a library that will serve as an abstraction layer between the modem and the application. Meaning, the application will call some functions and the GSM library will interact with the modem using the ...
by Azimon
Mon Oct 10, 2011 4:36 am
Forum: Wireless/RF
Topic: GSM abstraction layer API (for Telit)
Replies: 0
Views: 259

GSM abstraction layer API (for Telit)

Hi. I am new GSM, and am planning to use a Telit module in my project (GE864). I would like to create a library that will serve as an abstraction layer between the modem and the application. Meaning, the application will call some functions and the GSM library will interact with the modem using the ...
by Azimon
Sat Aug 27, 2011 10:22 am
Forum: SparkFun Product Questions
Topic: Why did the zener short...
Replies: 8
Views: 1139

Re: Why did the zener short...

Thank you I will have a look.
What is your view on:
- TVS diodes (also vs. zeners)
- Resettable fuses
by Azimon
Sat Aug 27, 2011 8:15 am
Forum: SparkFun Product Questions
Topic: Why did the zener short...
Replies: 8
Views: 1139

Re: Why did the zener short...

The maximum power dissipation of the Zener diode was probably exceeded. Hmmm..... I assume that what happened, was that first the zener failed and then the fuse blew (well, obviously...). "Maximum power dissipation", do you mean that the current was large? Would that mean the voltage was great? Als...
by Azimon
Sat Aug 27, 2011 8:02 am
Forum: SparkFun Product Questions
Topic: Why did the zener short...
Replies: 8
Views: 1139

Why did the zener short...

I have the attached circuit as a input protection to a device that runs off a truck battery. After being on a truck for some time, fuse F1 had blown. On investigation, it is found that zener D1 is shorting. How can this be? I mean, how/why would a zener fail this way? I thought that the entire purpo...
by Azimon
Wed Aug 24, 2011 11:26 am
Forum: MSP Microcontrollers
Topic: Help setting up Watchdog Timer for MSP430F1612
Replies: 10
Views: 4247

Re: Help setting up Watchdog Timer for MSP430F1612

One solution that comes to mind is to check if you are using ACLK for any of your peripherals and see if you are using the DCO for anything. If not, you could configure the DCO to output on ACLK and use ACLK for the WDT. By adjusting the divisor and the DCO, you might be able to get your 4 second p...
by Azimon
Wed Aug 24, 2011 9:17 am
Forum: MSP Microcontrollers
Topic: Help setting up Watchdog Timer for MSP430F1612
Replies: 10
Views: 4247

Re: Help setting up Watchdog Timer for MSP430F1612

The sample code you provided simply shows that timerA in configured to use SMCLK as its input. It does not indicate the speed of the clock nor does it specify that SMCLK is used for the WDT. It is using X2 and has a 6MHz crystal, SMCLK is (should be) derived from this. As far as what the WDT is usi...
by Azimon
Wed Aug 24, 2011 8:46 am
Forum: MSP Microcontrollers
Topic: Help setting up Watchdog Timer for MSP430F1612
Replies: 10
Views: 4247

Re: Help setting up Watchdog Timer for 1612

We are getting closer. First you need to know how the ACLK and the SMCLK are configured. Figure 4-1 shows you the sources for each clock and the bits that are used to control the clock "beast". You will also need to know what rates each clock is operating at. Next you will need to understand what p...
by Azimon
Wed Aug 24, 2011 8:05 am
Forum: MSP Microcontrollers
Topic: Help setting up Watchdog Timer for MSP430F1612
Replies: 10
Views: 4247

Re: Help setting up Watchdog Timer for 1612

What do you want the WDT to do? Act as a watchdog? Act as a timer? At what rate? What clock source? Have you read chapter 10 of the User Guide (slau049f.pdf)? Hi. I read Chapter 10 but sorry it is beyond my skills at the moment to understand and trust what ever solution I might hack out. I realize ...
by Azimon
Tue Aug 23, 2011 11:09 pm
Forum: MSP Microcontrollers
Topic: Help setting up Watchdog Timer for MSP430F1612
Replies: 10
Views: 4247

Help setting up Watchdog Timer for MSP430F1612

Hi. I need some help setting up the Watchdog Timer for the 1612 and using it. I am not an embedded developer per-se, though I can tweak the logic parts of my application, and this is why I need help with this. Thanks very much.
by Azimon
Thu May 19, 2011 9:07 pm
Forum: SparkFun Product Questions
Topic: Flux vs. solder?
Replies: 12
Views: 1975

Re: Flux vs. solder?

What you really want for SMD work by hand is solder paste, which is ground up solder mixed with flux in a syringe. OK. Can you recommend a specific type or specification? (preferably from Farnell...) So you mean I should use Solder Paste for all SMD work instead of my regular solder (which yes, has...
by Azimon
Thu May 19, 2011 4:32 am
Forum: SparkFun Product Questions
Topic: Flux vs. solder?
Replies: 12
Views: 1975

Flux vs. solder?

OK this is totally a basic question but please bear with me, just a little confused about it, so asking. I have been doing my SMD soldering work with regular solder (and iron, no reflow). I happen to have a small syringe of no-clean flux (which I got with QuickChip) and decided to try it out. I put ...
by Azimon
Tue Mar 29, 2011 5:03 am
Forum: SparkFun Product Questions
Topic: Problem using I2C and UART in MSP430
Replies: 0
Views: 258

Problem using I2C and UART in MSP430

I am using UARU0 of my MSP430F1612 in both I2C and UART mode. Everything is basically fine, but , every time I switch back from I2C to UART, I get a "glitch" on the Tx line (i.e. a high to low pulse). Can't figure out what is causing it. This is my code: void I2C_Exit(void) { UCTL0 |= SWRST; U0CTL &...