• on Test & Measurement
  • Published in issue 2/2012 on page 22
About the article

Pico C-Plus and Pico C-Super

Elektor’s ‘small-C’ meter upgraded in two ways

Pico C-Plus and Pico C-Super

The popularity of All Things Test & Measurement among Elektor readers got substantiated once again recently by Pico C, a cute DIY capacitance meter specially designed to deal with small capacitors like below 10 pF, much to the enjoyment of radio amateurs and leaving professional instruments well behind. One limitation of the instrument was noted though, its maximum value of about 2500 pF, triggering reader Jon Drury to write new software culminating in two new versions called Pico C-Plus and Pico C-Super. C+? No, assembly language was used to write the firmware.

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Products
Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Extra info, Update
Completely rewritten software (assembly code). Ready-programmed controllers available.
Extended capacitance range: <1 pF to 500 nF, max. resolution 0.01 pF
3 capacitance ranges: 5 nF, 50 nF, 500 nF
Pico C-Plus: software upgrade only; no PCB modifications required
Pico C-Super: software upgrade & minor PCB alterations required. Reworked PCB available.
Period meter ranges: 16 ms, 160 ms, 1.6 s
Frequency meter range: 8 MHz, max resolution 1 Hz
Signal Generator:
- range 0.8 Hz – 10 MHz
- resolution 0.1% up to 10 kHz, 1% across 10 kHz – 100 kHz
- square wave 0 – 5 V

Components
Download the BOM list
The BOM (Bill of Materials) is the technically exhaustive listing of parts and other hardware items used to produce the working and tested prototype of any Elektor Labs project. The BOM file contains deeper information than the Component List published for the same project in Elektor Magazine. If required the BOM gets updated directly by our lab engineers. As a reader, you can download the list here.
Want to learn more about our BOM list? Read the BOM list article for extra information.
Pico C-Super version only
Resistors
R1 = 1MOhm 1%
R2 = 5.6Ohm 5%
R3,R4 = 100Ohm 5%
P1 = 10kOhm 20%, preset
Capacitors
C1 = 10?F, 63V, lead spacing 2.5mm
C2,C3,C4 = 100nF 50V ceramic, lead spacing 0.2’’ (5.08mm)
C5,C6 = 15pF 100V 5%, ceramic, lead spacing 0.2’’ (5.08mm)
C7 = 220pF 63V 1%, polystyrene, lead spacing 7.18mm
Semiconductors
D1 = 1N4004
D2-D5 = BAT85
IC1= 7805
IC2= TLC555
IC3 = ATtiny2313, programmed, Elektor # 110687-42*
Miscellaneous
JP1,K2,K3,K4 = 2-pin pinheader, straight, lead pitch 0.1’’ (2.54mm)
JP1 =jumper 0.1’’ (2.54mm)
K1 = 2-way PCB screw terminal block, lead pitch 5mm
K2,K3,K4 = 2-way socket, straight, lead pitch 0.1’’ (2.54mm)
LCD1 = LCD, 2x16 (TC1602C-01YA0_A00), Elektor # 120061-71*. Check pinout when using any other device.
LCD1 socket = 16-way SIL, lead spacing 0.1’’ (2.54mm), right angled
LCD1 plug = 16-pin pinheader, lead spacing 0.1’’ (2.54mm), right angled
S1 = pushbutton, SPNO, tactile feedback, 6mm
X1 = 20MHz quartz crystal, CL = 18pF, 50ppm
PCB # 110687-1

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