I've got an Endless Pool set up on my back deck. For those that don't know, it's basically a treadmill for swimming. You can change the speed of the current using a remote key fob. The receiving board has an RJ-14 jack for output that allows you to hook up a pace display that gives a rough estimate of your pace per 100 meters. The downside is the display is $150. Seems a bit steep to me for what it is. I don't really care about what the alleged pace is. I wouldn't trust that it was accurate anyway. However, since I do increase and decrease the speed of the current quite a bit as I warm up and do intervals of different intensities, I'd like a way to return to the same speeds consistently.
Keep in mind the subject of this post. I really don't have any idea what I'm talking about from here on out.
The circuit diagram for the controller shows the wiring for the RJ-14 jack. Pin 1 is 24 COM, Pin 2 is 4-20 mA OUT. Pin 3 is 4-20 mA COM. Pin 4 is 24 VDC. I measured the voltage across pins 2 and 3. At the lowest speed setting possible, it was 1.238. As I increased the speed, the voltage increased pretty steadily by about .029 volts. All I really want to do is hook up a display that will show that voltage. That would be good enough.
I only need something that shows voltage in the single digits and has 2 decimal places. I'd like something at least a couple of inches high so I can see it relatively easily from the pool. Obviously it has to work off the power output available through the jack. I don't know if I should have a preference for LCD or LED. I have no idea what else I should be saying or asking. Anyone have thoughts, advice, or display options?
Keep in mind the subject of this post. I really don't have any idea what I'm talking about from here on out.
The circuit diagram for the controller shows the wiring for the RJ-14 jack. Pin 1 is 24 COM, Pin 2 is 4-20 mA OUT. Pin 3 is 4-20 mA COM. Pin 4 is 24 VDC. I measured the voltage across pins 2 and 3. At the lowest speed setting possible, it was 1.238. As I increased the speed, the voltage increased pretty steadily by about .029 volts. All I really want to do is hook up a display that will show that voltage. That would be good enough.
I only need something that shows voltage in the single digits and has 2 decimal places. I'd like something at least a couple of inches high so I can see it relatively easily from the pool. Obviously it has to work off the power output available through the jack. I don't know if I should have a preference for LCD or LED. I have no idea what else I should be saying or asking. Anyone have thoughts, advice, or display options?
