Introduction: Tiny Auto-measuring Cap Seven Segment With Mini
If you have learned about the capacitor(RF CIRCUIT).
the H bridge seems too complex, too many to adjust,
too many to change and too many to read for
just balancing the bridge ! (not include S.G and CALCULATES yet)
LOOK HERE !
you don't even use one single finger, it's just tell how
many uF OR nf indeed the cap is whatever !
Step 1: Material
i use 2 SSDs and 2 LEDs
to display the value and scale
for all resistor i use 330 OHM to limits the current down.
because the arduino mini have the MAX current limits !
and then the 1 LED is for the decimal point,
the other LED is as uF indicator.
Step 2: Tools
Step 3: Open the Phone Line Box and Clean All
use the "+" screw driver to remove all the copper bars and all the screws.
Step 4: Cutout the Hole for SSD
use the cutter to cut the cover of phone line box.
in order to embed the Seven Segment Displayer parts.
Use the hand drill to drill 2 holes in order to show
the u led and to show the point led.
Step 5: Soldering the SSD and the Resisters
use cutter to shorten the PCB, in order to fit it into the cover.
i didn't connect to the second digit to display
the "F" because the MAX current limits too !
Step 6: Testing
after soldering the resistors and mini.
And make some test.(10uF, 4.7uF, 1uF, 10nF, 47nF)
1)C<99.9 uF then turn ON c', d', e' .
in order to show the "u".
2)C<1 uF then turn ON c', e', g' .
in order to show the "n".
Step 7: Fixed the PCB With Hot Glue
use the hot glue gun to fixed the PCB on the cover.
Step 8: Coding
i use 3 know how to coding :
i use the library to display.
2)i turn the charge pin ON for 10 uS as a aquare wave
to ensure the min C >= 0.005 nF
in order to avoid mini crashing !
T = RC
T/0 = divide by zero (error) !
so let the c(min) > 0.005 nF
3)i slow down the charge speed by increase R.
R = 240K. OHM, c = 1uF
so the T = 240 *1E3 *1E-6
T = 0.24 s
in order to increase accuracy.
Step 9: Embedding the 3v Battery Into the Box
a bit feature:
Since you could auto-measuring the capacitors, and then
the next thing you could do is making a network (RF TANK)
Participated in the
Automation Contest 2016