Category Archive: USB-Wisp

Aug 29

USB-Wisp

Because a usb->serial converter coupled takes a lot of space, I’ve decided to build a wisp programmer with a build in converter. I used a ft232 for this job. With the jumper on the pcb I can choose between “target powered” and “usb powered”.

The circuit:

schema USB-Wisp

(Clickable)

The pcb layout:

Print Layout USB-Wisp

Silkscreen-bottom pdf: Link

Copper-bottom pdf: Link

Copper-top pdf: Link

Silkscreen-top pdf: Link

Pictures:

Print USB-Wisp

Print USB-Wisp

Print USB-Wisp

Print USB-Wisp

Print USB-Wisp

Part list:

R1 4k7 0805
R2 10k 0805
R3, R9, R10, R12 1k 0805
R4, R5, R6, R7, R8, R11 47R 0805
C1, C2, C3, C4 100n 0805
C6, C7 22pF 0805
C8, C9 1µF 0805
C10 22µF
C11 100µF
D1, D2, D3 BAT85
D4 SB140 SMD
D5 1N4148
IC1 FT232RL SSOP28DB
IC2 PIC16F648A SO-18W
JP1 3p JUMPER
L1 INDUCTOR 0603
LED1 LED 3MM Red
LED2 LED 3MM Green
Q1 20Mhz kristal
Q2 BC847 SOT23
SV1 5P female header
X1 USB MINI connector
X2 15p male sub-d

The hex file for the pic can be found here: http://www.voti.nl/wisp648/