From 83e39f5debf331f75021ebf3e2959892d1dd3e51 Mon Sep 17 00:00:00 2001 From: pyr0ball Date: Fri, 11 Oct 2019 17:22:59 -0700 Subject: [PATCH] documentation formatting fixes #docs --- .../config/pyr0piezo-parameters/pyr0piezo-parameters.md | 3 +++ 1 file changed, 3 insertions(+) diff --git a/docs/tutorials/config/pyr0piezo-parameters/pyr0piezo-parameters.md b/docs/tutorials/config/pyr0piezo-parameters/pyr0piezo-parameters.md index 1605da9..7c8b4ef 100644 --- a/docs/tutorials/config/pyr0piezo-parameters/pyr0piezo-parameters.md +++ b/docs/tutorials/config/pyr0piezo-parameters/pyr0piezo-parameters.md @@ -9,6 +9,7 @@ To begin, we start with the piezo element itself, which usually consists of a di The piezo's output is tied to a high impedance input of an [Operational Amplifier](https://www.electronics-tutorials.ws/opamp/opamp_1.html). The Amp stage takes the signal from the piezo and increases it's voltage by a factor, anywhere between 3x and 11x depending on the `GAIN_F` setting. This amplified signal is then passed through to the third stage. The wire between Stage 1 and Stage 3 is also attached to the output of Stage 2 through a high-ohmage resistor. Adjusting the `GAIN_F` setting is the coarsest and easiest way to adjust the sensor's sensitivity. Use cases for adjusting `GAIN_F`: + - Sensor is not sensitive enough, or is too sensitive - Many false triggers during movement @@ -19,6 +20,7 @@ Use cases for adjusting `GAIN_F`: This stage utilizes a combination of a PWM-based DAC, another Amp channel, and a high-ohmage resistor. The purpose of this stage is to provide a "Voltage Floor" or a "Virtual Ground" to the Low-Side input of Stage 3. This stage is governed by the `VFOL` setting. The essential effect of this stage is that any signal input from the first stage that falls below the `VFOL` threshold will be filtered out and suppressed. This setting can be used to address a noisy input signal from too much EMI, static electricity, or other factors. Use case for adjusting `VFOL`: + - Many false triggers when stationary - Many false triggers during movement @@ -29,6 +31,7 @@ Use case for adjusting `VFOL`: This stage of the circuit utilized another PWM-based DAC to set a "trigger threshold", which is governed by the `VCOMP` setting. When the input signal from the previous two stages increases beyond the threshold set by `VCOMP`, the sensor's Z-Min signal is tripped and a Z-Min trigger signal is sent to the control board of the 3D Printer. As the Follower's filtering signal is attached to this input through a high-ohmage resistor, the amount of time it takes for this triggering circuit to reset is extended, which further reduces multiple trigger signals from being sent. By default, `VCOMP` is set to 2.85v which should be compatible with even 3.3v systems, but there could be instances where the `VCOMP` setting is higher than what the rest of the circuit can provide, and therefore no triggering would occur, even with valid input. Use case for adjusting `VCOMP`: + - No triggering from the sensor at all - Low input voltage