Binford 7000 Light Controller

[Scott Wiper]

Fred Bloggs
I am keeping botrh timer sections for the reason that I want to have a dark out of reset function so that The 5 hour delay starts when timer section a comes out of reset. For example if Ralay A shuts of at 6.45PM I want relays B to stay on exactly for exactly five hours after. To 11:45PM. I want a exact five hour delay regardless of Relay A out of reset on U2 U3 U4 U6 U9.

I have fixed my math error on U2 that is now 600HZ /10 giving me 60HZ. It's output on Pin 1 not Pin 3.

Sheet A http://www.travel-net.com/~swiper7000a.gif

The 74LS273 will be on a 1HZ sample from the Q pin (Pin 1) on U13 so it won't "freeze" when U2 U3 U4 U6 U9 are in reset when the LDR is in full light.

Sheet B http://www.travel-net.com/~swiper7000b.gif


--
My cat Tigger says every morning...
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To contact follow the link below.
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--
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

 

[Fred Bloggs]

Scott Wiper wrote:

Fred Bloggs I am keeping botrh timer sections for the reason that I
want to have a dark out of reset function so that The 5 hour delay
starts when timer section a comes out of reset. For example if Ralay
A shuts of at 6.45PM I want relays B to stay on exactly for exactly
five hours after. To 11:45PM. I want a exact five hour delay
regardless of Relay A out of reset on U2 U3 U4 U6 U9.

I understand that- so let's say you have a single 1Hz counter chain that
runs continuously -always sampling the comparator outputs. When the
circuit is in the LIGHT state then:
1) enable the 1 second pulses to the totalizer ( at 6 minute = 1/10th
hour rate?)
2) activate RLY DRVR A
3) activate RLY DRVR B
4) hold this state indefinitely until LIGHT-to-DARK transition

While in the LIGHT state, IF the LDR comparator indicates a
LIGHT-to-DARK transition, then:
1) enable the 120 second counter, no other signal changes made
2) wait for 120s timeout and RST 120 second counter on any DARK-to-LIGHT
transition of LDR
3) IF LDR remains DARK throughout 120 second interval then put circuit
in DARK state ELSE circuit remains in LIGHT state

The circuit in DARK state for less than 5 hours is:
1) 1 second pulses to totalizer remain enabled
2) RLY DRVR A is OFF
3) RLY DRVR B is ON
4) 5 HOUR timer is taken out of RST and allowed to count
5) Hold this state until the sooner of 5.1) LDR indicates DARK-to-LIGHT
transition after passing 120 second timeout test, or 5.2) 5 HOUR timer
indicates 5 hour mark has been reached.

The circuit is in DARK state > 5 hours, then:
1) 1 second pulses to totalizer disabled
2) RLY DRVR A is OFF
3) RLY DRVR B is OFF
4) circuit remains in this state until LDR DARK-to-LIGHT transition
passes 120 second timeout test.

I have fixed my math error on U2 that is now 600HZ /10 giving me
60HZ. It's output on Pin 1 not Pin 3.

Sheet A http://www.travel-net.com/~swiper7000a.gif

Your U4/U5 will not work: U5 goes HIGH in U4 states
60,61,62,63,124,125,126,127 which translate in time to pulses at times
1.0s, 2.07s, 3.11s, 4.18s...etc- so this needs to be fixed.
Then U6/U5 are labeled divide by 120 when this is a divide by 60, and
this divider has the same problem as noted with U4/U5.
There is no delay at all on the comparator outputs- this is not good.
Also the RLY DRV A will have trouble driving the CMOS 4071 and ULN2003
HIGH at the same time- you can change this like so:
Please view in a fixed-width font such as Courier.



CD4071
____
PWR ON RST>-------------------------\ \
| >----> MASTER RST
+------------------/___/
|
| 74LS273
| +-----+
| | | +-ULN2003---
| | | RLY DRV A |
LDR COMP>----------+-----D0 Q0--------------|
| | | | |
| | | | |
| | | | |
| | | | |
| | | | |
| +-----D4 Q4--+ |
| | | |
| | | |
| +-----+ |
| |
4.7K | |
5V--/\/\-------+------------------+


Keep plugging at this.

The 74LS273 will be on a 1HZ sample from the Q pin (Pin 1) on U13 so
it won't "freeze" when U2 U3 U4 U6 U9 are in reset when the LDR is in
full light.

Sheet B http://www.travel-net.com/~swiper7000b.gif

Sheet B is very good- use this as an example of how to fix the counters
on sheet A.