Difference between revisions of "Velleman WFS210"
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http://www.velleman.eu/downloads/0/information/protocol_wfs210.pdf | http://www.velleman.eu/downloads/0/information/protocol_wfs210.pdf | ||
(oddly, the protocol is described in terms of frames such as <STX> ... <ETX> as though on a serial stream. It doesn't mention TCP ports or USB endpoints) | |||
== Resources == | == Resources == | ||
Revision as of 00:42, 1 January 2015
The Velleman WFS210 is a claimed to be the first WiFi oscilloscope. It has 2 channels, and 10MS/s sampling rate per channel.
See Velleman WFS210/Info for more details (such as lsusb -vvv output) about the device.
Description
I saw this first in Maplin (UK electronics chain) priced at about £180. It seemed a lot for a 2-channel, 8 bit, 1MHz oscilloscope shipped without probes or charger, but it has some unusual features :
- Wifi & internal battery for self-contained remote connection to a tablet or PC
- Charges off USB (mini plug)
- Supported on IOS, Android 4, Windows
And, much praise to Velleman for
- Sources for Android build on github
- Protocol description on manufacturers site
I had a need to monitor the signals on a friend's rotating machinery, so when I saw a brand new example of this on an auction site for 1/4 the listed price, I snapped it up.
Taking it apart, I broke it : the power button really needs to be removed first / fitted last, levering the board out without removing the button damaged the switch. A wire link fixes it for now. Beware!
Hardware
Control logic
- Microchip dsPic33EP256MU806 microcontroller
- 12MHz crystal: clock source for the dsPic
USB interface
- onboard the dsPic
Wifi interface
- Roving Networks (Microchip) RN171-I/RM
Analog frontend
- 6 x EGE EDR301A0528 reed relays (3 per input channel)
- 6 x variable capacitors (3 per channel)
- 4 x variable resistors (2 per channel)
- 2 x Texas Instruments OPA354 op-amps
- 1 x Microchip 6404E quad op-amp
- 1 x Maxim 1192E 8-bit 22MSPS dual A/D converter
Power
- 1 x 3.7V 1.8Ah lithium battery
- 1 x 7387 Lithium pack charge controller
- 1 x TJ 42MD7LE regulator
?
- 8-pin pack marked 'NXC' near TI opamps
Photos
WFS210 with Android tablet
Screws under feet
Under cover
PCB with screen
Battery and switch
Wifi radio
PCB topside
PCB underside (no components under foil)
Protocol
http://www.velleman.eu/downloads/0/information/protocol_wfs210.pdf
(oddly, the protocol is described in terms of frames such as <STX> ... <ETX> as though on a serial stream. It doesn't mention TCP ports or USB endpoints)
Resources
Software :
- iTunes
- Android (4.0 or later) Android sourcecode
- Windows
Manuals :