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Last update:
Oct 31/16 (65)

    

           Comparing the K145, VK011 and K190

This page presents a feature comparison of the DIY/Kitsrus K145 and K190, and the Qkits VK011 kits. 
  

Features  

K145

  VK011

  K190

Visuals  

  k145pic.jpg (21315 bytes)

  vk011_as_built.jpg (36692 bytes)

 K190 case front-back.jpg (49907 bytes) 

Source   DIY/Kitsrus (through its distributors)   QKits   DIY/Kitsrus (through its distributors)  
Based on Quozl      Unknown     New design by Frank Crivelli, inspired by K145.   
Temperature Sensors   DS18S20  1-Wire  DS18S20  1-Wire   DS18S20 and DS18B20   
1-Wire (can be mixed) 
# of Channels   4 - temperature monitoring only.  4 - temperature monitoring only.   4 of temperature monitoring 
and 4 of relay control.  
Communications   Serial  2400/8/N/1   Serial  9600/8/N/1   Serial  9600/8/N/1 
or 2400/8/N/1
Full RS232   No   No   Yes  
Power source From the serial port From the serial port, 
or external (by jumper)
12V DC external 
Power indicator No Yes Yes
Data indicator No No Yes
Configurable F/C jumper on board only
**There is apparently a calculation error when using 
Deg F, at temperatures above 
95 Deg F.  
See Quozl's Wiki  
Yes, internal config, accessible from external device (eg: PC).  Set F or C, or both;  Data in tab or csv format; Data rate adjust from 1 per second to 1 per 99 minutes; View 1-wire device serial #s, crc errors, Hi/Lo values, and connection problems for each sensor connected. Baud rate jumper on the circuit board.
Data send Automatically sends 1 channel per second.  So, 4 channels will take 4 seconds. Automatically sends 4 channels one after the other, but in a "burst".  Frequency of bursts is dependent on configured data rate.   The board has to be polled (send a command) to get temperature data. 
Control data send (on/off) Indirectly, through the DTR line, 
which is the power supply line.  
As wired, no -- it starts sending as soon as a connection is established.  Could be rewired to be similar to K145.  Yes - (as above) send a command to get data. 
Live sensor connect/disconnect Yes Yes Yes
On-board transient protection No No No
Reset function No, disconnect/reconnect (ie: remove power) to force a reset.   As for K145. As for K145.
Board can be mounted in a case. Yes, but modifications needed. As for K145. Case is included.
Software included old DOS version available online 3rd party available online "K190TCstd" available online 
Cost (at Sep/15) $34.95 USD at QKits 
(part # QK145)
$24.95 USD at QKits
(part # VK011K)
$68.95 USD at QKits
(part # QK190)
       
Notes
1. It's not difficult to add an LED to the K145 for power indication (see here).
2. The F/C jumper on the K145 board isn't too useful -- it's more efficient toset the board
       to Deg C, and do the Deg F conversion in software.
3. As with the K145, the VK011 internal config features are mostly not useful.The 
       exception might be checking for crc errors or device serial numbers,or viewing 
       connection status.Otherwise, the available config features are better done in 
       software.
4. From looking at how communication works for accessing the internal config features
       of the VK011, it appears the VK011 board was originally designed to connect to
       something other than a PC. Most likely another microcontroller board, with timestamp
       capabilities, a keypad, an LCD display, and EEProm storage. This could make for a
       "portable" solution, and fits with the reference in the VK011 docs to the possibility of
       using solar power. The internal config features make more sense when the board is
       used in this way.
5. QKits also have a "polling" version of the VK011 (# VK011P). With this version, the
       software tells the board when to send data. This is the opposite of the standard
       version, which is constantly sending data.
 6. As noted in the chart, the K190 has to be polled to get temperature data. Thermostat 
       (relay) control is done through the computer software. The commandstructure for 
       getting data or controlling relays is similar to that of the K108 relay board.Commands 
       are in a simple text format. Temperature data can be taken from individual channels,
       or all 4 channels together.
 7. There is a K190 firmware upgrade (K190E) available from Ozitronics. It has internal 
       thermostat settings, so it can be disconnected from the computer, and still maintain 
       temperature control. Temperature data is pushed out to the computer (like K145) 
       rather than being polled. The push rate is configurable. There is also a relay "Toggle" 
       command added to the command set. Thermostat and push rate config settings are 
       saved internally in the new firmware. (software available here)
 8. See this page for a comparison of software versions for the K190.   
 9. MinTermLite is useful for testing connections and commands with these kits.

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