S
Scott Wiper
Guest
First of all I would like to thank all your help with the problem with the Binford 7000 light controller. My aplogies for this cross post.
I have solved the "short" pulse problem be removing the gates that were attached to binary counters. I am now using CD4017 decade decimal counters that are stretching the seconds and minutes and hours to 50% duty cycles, except for the 74LS273 that receives a pulse every 240 seconds. Set up by U7 U8 and U9, on sheet one. All Ic's have .1uF caps on their power pins to reduce noise. This is not shown on links links below.
The seconds duty cycle is suppled by U4 U5, on sheet one.
On sheet one 7000.gif
There is a R/C network with a normally open switch. This to provide a short reset pulse to all chips when power is applied so they all start at zero. U9 is reset the same way but R8 pulls MR high after power on clearing. All Outputs Low. I am now using a 74LS20 4 input NAND gate to clock the 273 because it requires a positive edge clock. SW1 Is to provide you with any time reset.
The reason I am building this curcuit is to control low wattage grow lighting in small area of my living room so I can grow produce during the winter. Catnip and cat grass for bith of my cats to give them something natural to eat. The whole idea is to turn on the lighting in the morning with a LDR that has adjustable sensitivity so you can adjust the morning on time. U14 on sheet B is a 5 hour time out delay that is held in reset by U9 that is attached to U6 but the 273's inputs are pulled low R6 and 7. D1 D4 and D5 are to prevent the devide by 6 pulses from going back into the master reset line. The time is to hold on only half of the lighting after sunset. This provides a extended light cycle to the plants from 8 hours in to 13 hours.
On sheet B there is four counter that are stretching out the the long delays from PIN 12 of the CD4017's this creates a .5HZ duty cycle and 30 second duty cycle (U10 U11) and a 30 minute duty cycle (U12 U13). On sheet C there is a timer IC advances a electromechanical totaliser for 6 minute of every hour through Q1. This will cause an advance when power is applied as well because of the power on reset.The battery backed up supply is to kepp it powered when AC power is lost
This was done on the project that is now been working for a 1 year. http://www.travel-net.com/~swiper/binford.htm and Th power supply that is being used for both is called the "Simple UPS". This is viewed by useing the back button and clicking on "Simple UPS"
LINKS for schematic viewing; There are now three sheets for this project. You can print these in landscape mode to fit the entire sheet.
http://www.travel-net.com/~swiper/7000.gif Sheet A
http://www.travel-net.com/~swiper/7000_2.gif Sheet B
http://www.travel-net.com/~swiper/7000_3.gif Sheel C
--
My cat Tigger says every morning...
"Before my morning coffee... I might as well be a dog!"
To contact follow the link below.
http://www.travel-net.com/~swiper/email.htm
I have solved the "short" pulse problem be removing the gates that were attached to binary counters. I am now using CD4017 decade decimal counters that are stretching the seconds and minutes and hours to 50% duty cycles, except for the 74LS273 that receives a pulse every 240 seconds. Set up by U7 U8 and U9, on sheet one. All Ic's have .1uF caps on their power pins to reduce noise. This is not shown on links links below.
The seconds duty cycle is suppled by U4 U5, on sheet one.
On sheet one 7000.gif
There is a R/C network with a normally open switch. This to provide a short reset pulse to all chips when power is applied so they all start at zero. U9 is reset the same way but R8 pulls MR high after power on clearing. All Outputs Low. I am now using a 74LS20 4 input NAND gate to clock the 273 because it requires a positive edge clock. SW1 Is to provide you with any time reset.
The reason I am building this curcuit is to control low wattage grow lighting in small area of my living room so I can grow produce during the winter. Catnip and cat grass for bith of my cats to give them something natural to eat. The whole idea is to turn on the lighting in the morning with a LDR that has adjustable sensitivity so you can adjust the morning on time. U14 on sheet B is a 5 hour time out delay that is held in reset by U9 that is attached to U6 but the 273's inputs are pulled low R6 and 7. D1 D4 and D5 are to prevent the devide by 6 pulses from going back into the master reset line. The time is to hold on only half of the lighting after sunset. This provides a extended light cycle to the plants from 8 hours in to 13 hours.
On sheet B there is four counter that are stretching out the the long delays from PIN 12 of the CD4017's this creates a .5HZ duty cycle and 30 second duty cycle (U10 U11) and a 30 minute duty cycle (U12 U13). On sheet C there is a timer IC advances a electromechanical totaliser for 6 minute of every hour through Q1. This will cause an advance when power is applied as well because of the power on reset.The battery backed up supply is to kepp it powered when AC power is lost
This was done on the project that is now been working for a 1 year. http://www.travel-net.com/~swiper/binford.htm and Th power supply that is being used for both is called the "Simple UPS". This is viewed by useing the back button and clicking on "Simple UPS"
LINKS for schematic viewing; There are now three sheets for this project. You can print these in landscape mode to fit the entire sheet.
http://www.travel-net.com/~swiper/7000.gif Sheet A
http://www.travel-net.com/~swiper/7000_2.gif Sheet B
http://www.travel-net.com/~swiper/7000_3.gif Sheel C
--
My cat Tigger says every morning...
"Before my morning coffee... I might as well be a dog!"
To contact follow the link below.
http://www.travel-net.com/~swiper/email.htm