[TriEmbed] ping sensor accuracy?

[Alex Davis]

Anyone try those ultrasonic rangefinder ‘ping’ devices? Were you able to get any precision from them? I have mine pointed at a still pool of water, and get the following results:

got request from : 0x1:  humidity % = 74.94, temp C = 29.42, height cm = 195
got request from : 0x1:  humidity % = 75.30, temp C = 29.43, height cm = 172
got request from : 0x1:  humidity % = 75.57, temp C = 29.42, height cm = 173
got request from : 0x1:  humidity % = 76.06, temp C = 29.44, height cm = 173
got request from : 0x1:  humidity % = 75.20, temp C = 29.53, height cm = 173
got request from : 0x1:  humidity % = 75.06, temp C = 29.56, height cm = 143
got request from : 0x1:  humidity % = 75.56, temp C = 29.56, height cm = 172
got request from : 0x1:  humidity % = 76.20, temp C = 29.59, height cm = 172
got request from : 0x1:  humidity % = 76.90, temp C = 29.61, height cm = 145
got request from : 0x1:  humidity % = 77.80, temp C = 29.64, height cm = 145
got request from : 0x1:  humidity % = 77.67, temp C = 29.65, height cm = 172
got request from : 0x1:  humidity % = 75.59, temp C = 29.66, height cm = 166
got request from : 0x1:  humidity % = 76.22, temp C = 29.73, height cm = 143
got request from : 0x1:  humidity % = 76.74, temp C = 29.83, height cm = 172
got request from : 0x1:  humidity % = 76.16, temp C = 29.88, height cm = 165
got request from : 0x1:  humidity % = 76.09, temp C = 29.94, height cm = 172
got request from : 0x1:  humidity % = 75.67, temp C = 29.94, height cm = 167
got request from : 0x1:  humidity % = 76.20, temp C = 29.95, height cm = 167
got request from : 0x1:  humidity % = 76.61, temp C = 29.96, height cm = 174

That’s pretty bad, in my opinion. I’m wondering if it’s due to running it on 3.3v? I know it’s spec’ed for 5v. I was hoping to use 3.3v so I could use a solar charged 3.7v LiPo cell, but I suppose I could switch over to a 6v lantern battery and use one of the circuits here: http://forums.pa <http://forums.pa/>rallax.com/discussion/152308/ping-sensor-3-3v-compatible

Lantern battery isn’t rechargeable, but an Energizer-brand alkaline is rated for 56 Ah, so that ought to last a long time.

Alex

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