How To Make The HT12E Transmit (TE To Low) Only When One Or Both ...

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Learn more about Teams How to make the HT12E transmit (TE to low) only when one or both buttons are pressed? Ask Question Asked 4 years, 6 months ago Modified 1 year, 4 months ago Viewed 1k times 0 \$\begingroup\$

I followed this video: https://www.youtube.com/watch?v=-xK0B_bM-yk and made these circuits:

Transmitter:

Receiver:

And they work as I want them to. I have 2 pushbuttons so when one or both of them are being pressed, the corresponding LED/s on the receiver side light up, and when one or both of the pushbuttons are no longer pressed, the corresponding LED/s turn off (no latching on the HT12D decoder side because TE is constantly transmitting as it's hooked up to GND).

My question is - how can I (since battery life is important in my case) enable TE only when one or both of the buttons are pressed or stop being pressed. My goal is to not transmit all the time because I want to save battery. And also I don't want the LEDs to latch upon the receiver side so when the pushbutton/s stop getting pressed, I need the LED/s to turn off. What would be the simplest and most space-efficient (in terms of SMD components) way to do this?

• rf
• transmitter

Share Cite Follow asked Jun 10, 2020 at 5:36 JingleBellsJingleBells 41711 gold badge44 silver badges1111 bronze badges \$\endgroup\$ 7

• \$\begingroup\$ How long is needed for the transmit chip to steady itself into action from a change in the TE signal? What does the data sheet say? \$\endgroup\$ – Andy aka Commented Jun 10, 2020 at 9:44
• \$\begingroup\$ I'm not sure, sorry. Here's the datasheet of the HT12E - farnell.com/datasheets/1899539.pdf \$\endgroup\$ – JingleBells Commented Jun 10, 2020 at 9:54
• \$\begingroup\$ I could have found that without help but you need to try and figure this out. \$\endgroup\$ – Andy aka Commented Jun 10, 2020 at 9:56
• \$\begingroup\$ @Andyaka My only idea is to have an OR gate chip (since I have two buttons only) and when one or both are pressed, the OR gate chip connects TE to GND. But that wouldn't be SMD space efficient :\ \$\endgroup\$ – JingleBells Commented Jun 10, 2020 at 9:57
• \$\begingroup\$ That sounds a good start but do you need to ensure that TE is kept at ground following the release of a button so that data can be transmitted? If yes, then how long? \$\endgroup\$ – Andy aka Commented Jun 10, 2020 at 9:59

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Sorted by: Reset to default Highest score (default) Date modified (newest first) Date created (oldest first) 1 \$\begingroup\$

It may be easier than you think; if you look at the data sheet more closely: -

So, any button being activated will automatically pull TE low and enable transmission and, in the case when buttons are released (thus deactivating TE), this diagram tells you that the device will continue to transmit the four byte message and thus inform the receiver that buttons are deactivated: -

Share Cite Follow edited Jun 10, 2020 at 11:55 answered Jun 10, 2020 at 11:27 Andy akaAndy aka 473k2929 gold badges383383 silver badges839839 bronze badges \$\endgroup\$ 1

• 1 \$\begingroup\$ Comments are not for extended discussion; this conversation has been moved to chat. \$\endgroup\$ – Voltage Spike ♦ Commented Jun 13, 2020 at 4:28

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