Hi there
This is my first post so please, be gentle!
First off some info on the circuit, it is a PICAXE18X based timer project using a DS1307 RTC for time keeping and a 74LS164N to interface a HD44780 LCD using Hippys code and circuit design (Thanks Hippy!)
Outputs from the PICAXE switch 3, 5V relays, thru BC517 Transistors. The unit is powered from mains thru a bridge, smoothing caps etc then into a 7805 reg.
My problem is that as this is my first PICAXE project I have overlooked the issue of brownouts, particularly the DS1307, this seems the most sensitive to low supply voltage. Is there a simple circuit I could retro fit to my already built design?
I was thinking that I could feed all the chips power thru a transistor which was turned on from a zener diode fed thru a potential divider from the output of the 7805, does this sound feasible? do you guys have any 'standard' ways to deal with brownout's?
all help MUCH appreciated.
Regards
Lee Shephard
This is my first post so please, be gentle!
First off some info on the circuit, it is a PICAXE18X based timer project using a DS1307 RTC for time keeping and a 74LS164N to interface a HD44780 LCD using Hippys code and circuit design (Thanks Hippy!)
Outputs from the PICAXE switch 3, 5V relays, thru BC517 Transistors. The unit is powered from mains thru a bridge, smoothing caps etc then into a 7805 reg.
My problem is that as this is my first PICAXE project I have overlooked the issue of brownouts, particularly the DS1307, this seems the most sensitive to low supply voltage. Is there a simple circuit I could retro fit to my already built design?
I was thinking that I could feed all the chips power thru a transistor which was turned on from a zener diode fed thru a potential divider from the output of the 7805, does this sound feasible? do you guys have any 'standard' ways to deal with brownout's?
all help MUCH appreciated.
Regards
Lee Shephard