Hi. First post so i apologise if this should be in the circuit design category.
I am making pressure plate type switch out of a 4 button 433mhz keyfob. The whole thing is a cushion made from foam and conductive material that will contain the keyfob. When the cushion is sat on, the keyfob transmits. When the pressure is released, transmission will stop. This is.... ok. But im going to flatten batteries pretty fast. And im aware of "bounce" that may occur as people shift position. What i need ideally is:
1. On pressure, after a delay of one second, button 1 on the keyfob is activated, but only for a short period.
2. On release, after a one second delay, button 2 is activated, and again cuts off after a second or so.
3. While pressure is on, after transmission, power consumption is minimal. While there is no pressure, there should be no power consuption at all.
I have been reading this forum for the past couple of days and there are some similar posts. The extremely informative replies lead me to feel that i need some variety of monostable 555 set up. But im not sure if they deal with the power issue or the need for activating two separate buttons.
Confession: Im winging this. I have no experience with 555, and only a fleeting relationship with rf circuits. Im not looking for a complete cicuit diagram, just a few tips or pointers towards other solutions i might not have considered.
Thanks guys. A lot of you have already helped me and dont even know it.
I am making pressure plate type switch out of a 4 button 433mhz keyfob. The whole thing is a cushion made from foam and conductive material that will contain the keyfob. When the cushion is sat on, the keyfob transmits. When the pressure is released, transmission will stop. This is.... ok. But im going to flatten batteries pretty fast. And im aware of "bounce" that may occur as people shift position. What i need ideally is:
1. On pressure, after a delay of one second, button 1 on the keyfob is activated, but only for a short period.
2. On release, after a one second delay, button 2 is activated, and again cuts off after a second or so.
3. While pressure is on, after transmission, power consumption is minimal. While there is no pressure, there should be no power consuption at all.
I have been reading this forum for the past couple of days and there are some similar posts. The extremely informative replies lead me to feel that i need some variety of monostable 555 set up. But im not sure if they deal with the power issue or the need for activating two separate buttons.
Confession: Im winging this. I have no experience with 555, and only a fleeting relationship with rf circuits. Im not looking for a complete cicuit diagram, just a few tips or pointers towards other solutions i might not have considered.
Thanks guys. A lot of you have already helped me and dont even know it.