Forums

A timer device with relay

Started by Test October 25, 2017
I've been looking for a low power and low cost timer device or info on how I
could use to build one. I need to turn a relay on on a 5V device (a weather meter
doing a number of other task as well). The weather meter uses too much amps for
it to run on a battery.
The low poer timer device would run on coin cell batteries and very hour or
another predetermined time turn on a relay which would then turn power on the
weather meter (it uses a 9V battery). I've gotten a number of links to aruduino
like systems but these use too much current.

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On Wed, 25 Oct 2017 16:00:07 +0300, Test <test@.nil.invalid.com>
wrote:

>I've been looking for a low power and low cost timer device or info on how I >could use to build one. I need to turn a relay on on a 5V device (a weather meter >doing a number of other task as well). The weather meter uses too much amps for >it to run on a battery. >The low poer timer device would run on coin cell batteries and very hour or >another predetermined time turn on a relay which would then turn power on the >weather meter (it uses a 9V battery). I've gotten a number of links to aruduino >like systems but these use too much current. >
A number of Intermatic timers run on a battery, but control a relay that can be controlling any voltage up to 220VAC. ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | STV, Queen Creek, AZ 85142 Skype: skypeanalog | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | It's what you learn, after you know it all, that counts.
On Wednesday, October 25, 2017 at 9:00:14 AM UTC-4, Test wrote:
> I've been looking for a low power and low cost timer device or info on how I > could use to build one. I need to turn a relay on on a 5V device (a weather meter > doing a number of other task as well). The weather meter uses too much amps for > it to run on a battery. > The low poer timer device would run on coin cell batteries and very hour or > another predetermined time turn on a relay which would then turn power on the > weather meter (it uses a 9V battery). I've gotten a number of links to aruduino > like systems but these use too much current. > > --- > This email has been checked for viruses by AVG. > http://www.avg.com
What's low power? AC, DC what voltage? Something like an AC synchronous clock motor and gear head that spins once an hour? George H.
On Wednesday, October 25, 2017 at 9:00:14 AM UTC-4, Test wrote:
> I've been looking for a low power and low cost timer device or info on how I > could use to build one. I need to turn a relay on on a 5V device (a weather meter > doing a number of other task as well). The weather meter uses too much amps for > it to run on a battery. > The low poer timer device would run on coin cell batteries and very hour or > another predetermined time turn on a relay which would then turn power on the > weather meter (it uses a 9V battery). I've gotten a number of links to aruduino > like systems but these use too much current. > > --- > This email has been checked for viruses by AVG. > http://www.avg.com
A simple 55IC timer will do you. Google on 555 timer circuit. It's simple IC plus a few resistors and caps. The 555 output will need to drive a transistor base thru a ~5K resistor to pull in the relay between the collector and power supply.
On Wed, 25 Oct 2017 16:00:07 +0300, Test <test@.nil.invalid.com>
wrote:

>I've been looking for a low power and low cost timer device or info on how I >could use to build one. I need to turn a relay on on a 5V device (a weather meter >doing a number of other task as well). The weather meter uses too much amps for >it to run on a battery. >The low poer timer device would run on coin cell batteries and very hour or >another predetermined time turn on a relay which would then turn power on the >weather meter (it uses a 9V battery). I've gotten a number of links to aruduino >like systems but these use too much current. > >--- >This email has been checked for viruses by AVG. >http://www.avg.com
Does it need absolute accuracy (a specific time of day) or relative accuracy (every X hours +/- x minutes)? Picaxe is easy to use and can be happy on a few micro amps. 555 (cmos version) ditto. Picaxe can be set from milliseconds to decades without large timing caps. I'm doing stuff with small solar cells and capacitors for power storage.
On 2017-10-25, Test <test@> wrote:
> I've been looking for a low power and low cost timer device or info on how I > could use to build one. I need to turn a relay on on a 5V device (a weather meter > doing a number of other task as well). The weather meter uses too much amps for > it to run on a battery. > The low poer timer device would run on coin cell batteries and very hour or > another predetermined time turn on a relay which would then turn power on the > weather meter (it uses a 9V battery). I've gotten a number of links to aruduino > like systems but these use too much current.
If the arduino's using too much current you're doing it wrong. http://www.atmel.com/images/doc7903.pdf -- This email has not been checked by half-arsed antivirus software
Test <test@.nil.invalid.com> writes:

> I've been looking for a low power and low cost timer device or info on how I > could use to build one. I need to turn a relay on on a 5V device (a > weather > meter > doing a number of other task as well). The weather meter uses too much > amps > for > it to run on a battery. > The low poer timer device would run on coin cell batteries and very hour or > another predetermined time turn on a relay which would then turn power on the > weather meter (it uses a 9V battery). I've gotten a number of links to > aruduino > like systems but these use too much current. >
The old favorite ne555 will be suggested by many, but it does draw 1 - 5 mA while doing nothing. Much lower power use can be obtained from something like a Texas Instruments MSP430 MCU running Mecrisp Forth in low power mode 3 The Ti datasheet indicates that a maximum quiescent current draw of 1.5 uA applies in LPM3 (low power mode 3) with a 32768 Hz clock. Of course the MSP430 MCU can be used for a lot more than crystal controlled timing delays at the price of more power usage. Cheers, Terry -- Maintainer, Unofficial Mecrisp-Stellaris Embedded Forth Documentation: http://128.199.141.78/index.html
On Wednesday, October 25, 2017 at 3:00:14 PM UTC+2, Test wrote:
> I've been looking for a low power and low cost timer device or info on how I > could use to build one. I need to turn a relay on on a 5V device (a weather meter > doing a number of other task as well). The weather meter uses too much amps for > it to run on a battery. > The low poer timer device would run on coin cell batteries and very hour or > another predetermined time turn on a relay which would then turn power on the > weather meter (it uses a 9V battery). I've gotten a number of links to aruduino > like systems but these use too much current. > > --- > This email has been checked for viruses by AVG. > http://www.avg.com
You can use a RTC, like: https://datasheets.maximintegrated.com/en/ds/DS1339A.pdf and program it to set the Square Wave Output every hour. Bye Jack
Terry Porter wrote:
>Test <test@.nil.invalid.com> writes: > >> I've been looking for a low power and low cost timer device or info on how I >> could use to build one. I need to turn a relay on on a 5V device (a >> weather >> meter >> doing a number of other task as well). The weather meter uses too much >> amps >> for >> it to run on a battery. >> The low poer timer device would run on coin cell batteries and very hour or >> another predetermined time turn on a relay which would then turn power on the >> weather meter (it uses a 9V battery). I've gotten a number of links to >> aruduino >> like systems but these use too much current. > >The old favorite ne555 will be suggested by many, but it does draw >1 - 5 mA while doing nothing.
Vampire voltage?
On 2017-10-27, bruce2bowser@gmail.com <bruce2bowser@gmail.com> wrote:
> Terry Porter wrote: >>Test <test@.nil.invalid.com> writes: >> >>> I've been looking for a low power and low cost timer device or info on how I >>> could use to build one. I need to turn a relay on on a 5V device (a >>> weather >>> meter >>> doing a number of other task as well). The weather meter uses too much >>> amps >>> for >>> it to run on a battery. >>> The low poer timer device would run on coin cell batteries and very hour or >>> another predetermined time turn on a relay which would then turn power on the >>> weather meter (it uses a 9V battery). I've gotten a number of links to >>> aruduino >>> like systems but these use too much current. >> >>The old favorite ne555 will be suggested by many, but it does draw >>1 - 5 mA while doing nothing. > > Vampire voltage?
the internal voltage divider -- This email has not been checked by half-arsed antivirus software