Frequency meter - Revision history

Shawn: /* See also */

2014-04-14T21:22:28Z

Shawn: /* See also */

2014-04-14T21:22:12Z

Shawn: /* Components */

2014-03-27T23:10:09Z

Components

← Older revision		Revision as of 16:10, 27 March 2014
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	[[File:Voltage-regulator-circuit.png\|256px\|thumb\|right\|A typical 5V regulated circuit, with protective diode and output capacitor. The input voltage must be greater than the dropout voltage of the regulator plus the voltage of the diode plus the output voltage (see a data-sheet).]]		[[File:Voltage-regulator-circuit.png\|256px\|thumb\|right\|A typical 5V regulated circuit, with protective diode and output capacitor. The input voltage must be greater than the dropout voltage of the regulator plus the voltage of the diode plus the output voltage (see a data-sheet).]]
	**9V or a quartet of AAA with a 5V voltage regulator and capacitor(s), or		**9V or a quartet of AAA with a 5V voltage regulator and capacitor(s), or
	**120V AC to 5V DC ~~adapter~~, or		**120V AC to 5V DC adapter—I find phone chargers at thrift stores for $1 each, or
	**Three alkaline AAA or AA batteries, or		**Three alkaline AAA or AA batteries, or
	**Four NiMH rechargeable batteries, or		**Four NiMH rechargeable batteries, or

Shawn: /* Program with a hardware timer */

2014-03-27T16:51:51Z

Program with a hardware timer

← Older revision		Revision as of 09:51, 27 March 2014
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	#Set a falling or low interrupt on the pin attached to the switch. Will interrupt the program wherever execution is and go to associated interrupt routine.		#Set a falling or low interrupt on the pin attached to the switch. Will interrupt the program wherever execution is and go to associated interrupt routine.
	#Loop:		#Loop:
			##If there's a time recorded, note it and erase it.
			###If also there's a previous time recorded, calculate frequency.
	##If frequency is updated, display frequency.		##If frequency is updated, display frequency.
	##Go back to Loop.		##Go back to Loop.
	#Switch-detecting interrupt routine:		#Switch-detecting interrupt routine:
	##Record the time now.		##Record the time now.
	~~##If there's a previous time recorded, calculate frequency. Or use flags to do this outside this interrupt routine, so program can continue.~~
	#Timer-detecting interrupt routine:		#Timer-detecting interrupt routine:
	##Increase the time variable.		##Increase the time variable.

Shawn: /* Components */

2014-03-27T16:48:16Z

Components

← Older revision		Revision as of 09:48, 27 March 2014
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	*Power supply. Our LCD is expecting 4.7V to 5.3V.		*Power supply. Our LCD is expecting 4.7V to 5.3V.
	[[File:Voltage-regulator-circuit.png\|256px\|thumb\|right\|A typical 5V regulated circuit, with protective diode and output capacitor. The input voltage must be greater than the dropout voltage of the regulator plus the voltage of the diode plus the output voltage (see a data-sheet).]]		[[File:Voltage-regulator-circuit.png\|256px\|thumb\|right\|A typical 5V regulated circuit, with protective diode and output capacitor. The input voltage must be greater than the dropout voltage of the regulator plus the voltage of the diode plus the output voltage (see a data-sheet).]]
	**9V or a quartet of AAA with a 5V voltage regulator, capacitor~~(s), resistor~~(s), or		**9V or a quartet of AAA with a 5V voltage regulator and capacitor(s), or
	**120V AC to 5V DC adapter, or		**120V AC to 5V DC adapter, or
	**Three alkaline AAA or AA batteries, or		**Three alkaline AAA or AA batteries, or
	**Four NiMH rechargeable batteries.		**Four NiMH rechargeable batteries, or
			**Three NiMH rechargeable batteries with a 5V voltage booster.

	===Program===		===Program===

Shawn at 23:53, 26 March 2014

2014-03-26T23:53:32Z

← Older revision		Revision as of 16:53, 26 March 2014
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	**Alternatively, a TTL-to-USB or TTL-to-serial circuit for sharing data with computer ($18)		**Alternatively, a TTL-to-USB or TTL-to-serial circuit for sharing data with computer ($18)
	*Hook-up wires ($2)		*Hook-up wires ($2)
	*Power supply		*Power supply. Our LCD is expecting 4.7V to 5.3V.
			[[File:Voltage-regulator-circuit.png\|256px\|thumb\|right\|A typical 5V regulated circuit, with protective diode and output capacitor. The input voltage must be greater than the dropout voltage of the regulator plus the voltage of the diode plus the output voltage (see a data-sheet).]]
	**9V or a quartet of AAA with a 5V voltage regulator, capacitor(s), resistor(s), or		**9V or a quartet of AAA with a 5V voltage regulator, capacitor(s), resistor(s), or
	**120V AC to 5V DC adapter, or		**120V AC to 5V DC adapter, or

Shawn at 23:07, 26 March 2014

2014-03-26T23:07:55Z

← Older revision		Revision as of 16:07, 26 March 2014
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	===Program===		===Program===
	====Program without a hardware timer====		====Program without a hardware timer====
	~~For an explicit example, see [[Frequency meter on Arduino]].~~ For an attempt on the PICAXE 08M2, see [[Frequency meter with a PICAXE 08M2]].		For an attempt on the PICAXE 08M2, see [[Frequency meter with a PICAXE 08M2]].
	#Initiate the display		#Initiate the display
	#Set an interrupt on the pin attached to the switch. Will interrupt the program wherever execution is and go to Interrupt.		#Set an interrupt on the pin attached to the switch. Will interrupt the program wherever execution is and go to Interrupt.
Line 44:		Line 44:
	##Reset counter.		##Reset counter.
	====Program with a hardware timer====		====Program with a hardware timer====
			For an working example, see [[Frequency meter on Arduino]].

	Keep interrupt service routines as short as possible by having them set the minimum amount of variables and instead do the calculations in the main loop.		Keep interrupt service routines as short as possible by having them set the minimum amount of variables and instead do the calculations in the main loop.
	#Initiate the display		#Initiate the display
	#Set a timer interrupt. Will interrupt the program wherever execution is and go to associated interrupt routine.		#Set a timer interrupt. Will interrupt the program wherever execution is and go to associated interrupt routine.
	#Set an interrupt on the pin attached to the switch. Will interrupt the program wherever execution is and go to associated interrupt routine.		#Set a falling or low interrupt on the pin attached to the switch. Will interrupt the program wherever execution is and go to associated interrupt routine.
	#Loop:		#Loop:
	##If frequency is updated, display frequency.		##If frequency is updated, display frequency.

Shawn: /* Datasheets */

2014-03-26T22:30:30Z

Datasheets

← Older revision		Revision as of 15:30, 26 March 2014
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	===Datasheets===		===Datasheets===
			;Atmel ATmega328P-PU:28-pin PDIP micro-controller. http://www.atmel.com/images/atmel-8271-8-bit-avr-microcontroller-atmega48a-48pa-88a-88pa-168a-168pa-328-328p_datasheet.pdf
	;Electronic Assembly ED DOGM081-A:8-character LCD dot matrix display, with SPI serial control. http://www.lcd-module.com/eng/pdf/doma/dog-me.pdf		;Electronic Assembly ED DOGM081-A:8-character LCD dot matrix display, with SPI serial control. http://www.lcd-module.com/eng/pdf/doma/dog-me.pdf
	:Read various forums for discussions on using SPI between the micro-controller and this display. For example, one on how CSB must be used: http://forums.parallax.com/showthread.php/134847-EA-DOGM-162-Display		:Read various forums for discussions on using SPI between the micro-controller and this display. For example, one on how CSB must be used: http://forums.parallax.com/showthread.php/134847-EA-DOGM-162-Display

Shawn: /* Circuit */

2014-03-26T22:27:50Z

Circuit

← Older revision		Revision as of 15:27, 26 March 2014
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	===Circuit===		===Circuit===
	[[File:Frequency-meter-Arduino-on-a-board.png\|512px\|thumb\|right\|Circuit diagram for a frequency meter featuring an LCD display.]]		[[File:Frequency-meter-Arduino-on-a-board.png\|512px\|thumb\|right\|Circuit diagram for a frequency meter featuring an LCD display.]]
	For a detailed diagram, see [[File:Frequency-meter-Arduino-on-a-board.pdf]]. For a previous version using a much less precise PICAXE 08M2, see [[File:Frequency meter-PICAXE-08M2.pdf]].		For a detailed, printable diagram, see [[File:Frequency-meter-Arduino-on-a-board.pdf]]. For a previous version using a much less precise PICAXE 08M2, see [[File:Frequency meter-PICAXE-08M2.pdf]].

	===Components===		===Components===

Shawn: /* Circuit */

2014-03-26T22:26:48Z

Circuit

← Older revision		Revision as of 15:26, 26 March 2014
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	===Circuit===		===Circuit===
	[[File:Frequency-meter-~~PICAXE~~-~~08M2~~.png\|512px\|thumb\|right\|Circuit diagram for a frequency meter featuring an LCD display.]]		[[File:Frequency-meter-Arduino-on-a-board.png\|512px\|thumb\|right\|Circuit diagram for a frequency meter featuring an LCD display.]]
	For a detailed diagram, see [[File:Frequency-meter-Arduino-on-a-board.pdf]]. For a previous version using a much less precise PICAXE 08M2, see [[File:Frequency meter-PICAXE-08M2.pdf]].		For a detailed diagram, see [[File:Frequency-meter-Arduino-on-a-board.pdf]]. For a previous version using a much less precise PICAXE 08M2, see [[File:Frequency meter-PICAXE-08M2.pdf]].

← Older revision		Revision as of 14:22, 14 April 2014
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	===See also===		===See also===
	See more discussion and other circuits at [[Circuits for teaching physics]].		See more discussion and other circuits at [[Circuits for teaching physics]].

	[[Bicycle speedometer]] is essentially the same circuit and program, only displaying a different unit, and possibly adding an interface to change the wheel-diameter.		[[Bicycle speedometer]] is essentially the same circuit and program, only displaying a different unit, and possibly adding an interface to change the wheel-diameter.

	[[Category:Electronics]]		[[Category:Electronics]]

← Older revision		Revision as of 14:22, 14 April 2014
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	===See also===		===See also===
	See more discussion and other circuits at [[Circuits for teaching physics]].		See more discussion and other circuits at [[Circuits for teaching physics]].
			[[Bicycle speedometer]] is essentially the same circuit and program, only displaying a different unit, and possibly adding an interface to change the wheel-diameter.

	[[Category:Electronics]]		[[Category:Electronics]]