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Near Space:Geiger Counter

2010-09-06T11:46:16Z

← Older revision		Revision as of 11:46, 6 September 2010
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	I will try to give a short explanation of the '''Counter''' software. Remember, I am still learning, so, I am sure there are better ways of writing this program. But for me, this works.		I will try to give a short explanation of the '''Counter''' software. Remember, I am still learning, so, I am sure there are better ways of writing this program. But for me, this works.

-	'''TIMER0''' and '''TIMER1''' is configured as ~~a counter~~ and ~~counts~~ in the background while the PIC works on the rest of the program. '''TIMER0''' counts the seconds pulses from the Real Time Clock. '''TIMER1''' counts the output pulses from the RM-60 GM counter. The PIC communicates with the Real Time Clock (RTC) and the EEprom via the I2C buss. RS232 comes from the MAX232A chip. With this, we can connect to the serial port on a PC or Laptop or we can connect to a Packet controller and radio and transmit in real time to the ground from the Balloon.	+	'''TIMER0''' and '''TIMER1''' are configured as counters and count in the background while the PIC works on the rest of the program. '''TIMER0''' counts the seconds pulses from the Real Time Clock. '''TIMER1''' counts the output pulses from the RM-60 GM counter. The PIC communicates with the Real Time Clock (RTC) and the EEprom via the I2C buss. RS232 comes from the MAX232A chip. With this, we can connect to the serial port on a PC or Laptop or we can connect to a Packet controller and radio and transmit in real time to the ground from the Balloon.
	The RS232 Port is also used to download data from, and erase the '''EEprom'''. Additionally, we can initialize and set the RTC.		The RS232 Port is also used to download data from, and erase the '''EEprom'''. Additionally, we can initialize and set the RTC.

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Near Space:Geiger Counter

2010-09-03T01:27:14Z

← Older revision		Revision as of 01:27, 3 September 2010
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-	[[File:GM_Ckt_BD001.JPG\|thumb\|left\|Data Logger Board]] Here, we see the Data Logger Circuit Board. The PIC is the upper left chip and the upper right is the MAX ~~232a~~. The two chips on the next row are the Real ~~Iime~~ Clock and the EEprom. The voltage regulator at the bottom is an LM2940T Low Drop Out regulator. The circuit board was designed usiing [http://www.expresspcb.com ExpressPCB] (free)software.	+	[[File:GM_Ckt_BD001.JPG\|thumb\|left\|Data Logger Board]] Here, we see the Data Logger Circuit Board. The PIC is the upper left chip and the upper right is the MAX 232A. The two chips on the next row are the Real Time Clock and the EEprom. The voltage regulator at the bottom is an LM2940T Low Drop Out regulator. The circuit board was designed usiing [http://www.expresspcb.com ExpressPCB] (free)software.
	The green LED shows the Clock running by flashing at 1 second intervals.		The green LED shows the Clock running by flashing at 1 second intervals.
	The clear LED flashes to show system bootup and then flashes as each record is saved to EEprom.<br /><br />		The clear LED flashes to show system bootup and then flashes as each record is saved to EEprom.<br /><br />
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	The Source Code for the '''Counter & Data Logger''' can be found [http://www.barntek.net/Projects/DadsStuff/Geiger_Pics/G_Counter_projectV42.txt <here>] and the Source Code for the '''Utilities''' is [http://www.barntek.net/Projects/DadsStuff/Geiger_Pics/Utilities_Geiger.txt <here>].		The Source Code for the '''Counter & Data Logger''' can be found [http://www.barntek.net/Projects/DadsStuff/Geiger_Pics/G_Counter_projectV42.txt <here>] and the Source Code for the '''Utilities''' is [http://www.barntek.net/Projects/DadsStuff/Geiger_Pics/Utilities_Geiger.txt <here>].
		+
		+	I have only recently started programming PICs using the 'C' programming language.<br />
		+	I purchaced a course on line from [http://www.best-microcontroller-projects.com/c-programming-course-sales-page.html John Main] and, for me, it was money well spent.
		+
		+	I will try to give a short explanation of the '''Counter''' software. Remember, I am still learning, so, I am sure there are better ways of writing this program. But for me, this works.
		+
		+	'''TIMER0''' and '''TIMER1''' is configured as a counter and counts in the background while the PIC works on the rest of the program. '''TIMER0''' counts the seconds pulses from the Real Time Clock. '''TIMER1''' counts the output pulses from the RM-60 GM counter. The PIC communicates with the Real Time Clock (RTC) and the EEprom via the I2C buss. RS232 comes from the MAX232A chip. With this, we can connect to the serial port on a PC or Laptop or we can connect to a Packet controller and radio and transmit in real time to the ground from the Balloon.
		+	The RS232 Port is also used to download data from, and erase the '''EEprom'''. Additionally, we can initialize and set the RTC.
		+
		+	When the Radiation Counter boots up, it reads the stored address of the last recorded data from high memory in the EEprom. All variables are set to zero and then the clear LED flashes 3 times, indicating successful boot up. As it enters the loop, '''TIMER0''' is cleared and is ready to count seconds. Then, it checks for the 10 second interval. When it reaches 10 seconds, we read the RTC then check for memory full. If we get a memory full indication, the program stops all operations. If memory is not full, we increment the record number and write it and the time to the serial port. Now, we stop '''TIMER1''' and then read the '''TIMER1''' count. That is stored in the variable - radcnt - (Radiation Count). '''TIMER1''' is then reset and re-started and the Radiation Count is written to RS232.
		+	Next, we read ADC2 to get the battery voltage. (The PIC ADC will only read a maximum of 5 volts without damage so I am using a voltage divider in a divide by 3 configuration. This way we can read up to 15 volts without damaging the PIC.) The voltage being read, we send it to the serial port. Since all the previous data has been stored in variables, it is time to write it all to the EEprom. This data is written in HEX and only takes 8 bytes per record.
		+	The data being written to the EEprom, we increment the address counter for the EEprom and flash the clear LED indicating one record saved.
		+
		+	Now, we loop back and do it again until the memory is full or the power is switched off.