Weeder Technology Modules

XTension currently supports 3 models of the excellent modules from Weeder Technology The cards all connect via serial port so would require a USB/Serial adaptor and also require the weeder plugin from sentman.com Up to 6 weeder cards may be chained off a single USB/Serial adaptor and a single plugin license will connect to any number of cards. Additional cards may be added beyond the 6, but will require additional serial adaptors.

Digital I/O Module

Weeder Digital IO card

  • The Digital I/O module wtdio-m has 14 IO Channels. The first 7 are Schmitt Triggers and are easily connected to switch or sensor outputs. The top 7 are simple TTL level inputs and depending on what you're connecting may not work with just switches or may require additional hardware to get to work.
  • Any of the signal lines can be made output just by sending an on or off through XTension to the pin.
  • The card is addressed by XTension with an address in the X10 style. The first letter corresponds to the card address that you set via the dip switches. The second number is the number of the input pin on the module. Input lines on the module itself are lettered, but inside XTension you must give them a number instead.
  • The outputs aren't strong enough to drive a relay all by themselves and so it's necessary to build a relay interface card as shown in the tech document linked to above.
  • Only the sensing of input changes and the turning on and off of outputs is supported by XTension at this time. The module itself has many other features and if you need any of those supported directly please let us know.
  • The picture shows my weeder digital IO card as installed in a weather proof sprinkler controller case and connected to a home built 2 relay card for garage door remote control.
  • As of this writing (3/9/2009) there is no way to send a reset to the card through XTension. If you accidently send a command for a pin that pin will go into output mode and you'll not be able to read it's status again until you reset the card via a power cycle. A feature for resetting of the card is in the works.

Digital Input Module

  • The Digital Input Module wtdin-m has 8 input channels, but all can be used without external hardware for simple switch closures. They are also protected and can be used to sense the presence or absence of control voltages up to 40 volts. The 2 outputs on this module can directly drive a relay or other load up to 1 amp without external hardware.

Analog Input Module

Weeder Analog Input Module

  • The Analog Input Module wtadc-m has 8 single ended analog inputs that can also be configured as 4 differential inputs.
  • For the single ended reading the voltage input and the common ground pin on the card must be the same circuit or you'll read garbage.
  • Unused inputs should either be tied to the common ground pin or the inputs be given a large significant change value in XTension otherwise they will generate a new value on every read as untied inputs just return random numbers. Perhaps good for a random number seed?
  • XTension build 805 adds support for the new WTAIN input module that replaces this older module. You can download the latest beta version from the beta link here until it is promoted to a full release.

Solid State Relay Module

Beta level support for the SSR module WTSSR-M is included in the current beta version here As I don't actually have one of these modules I've implemented the protocol sight unseen so there may be issues yet and I am waiting to hear back from anyone that has one as to any issues that might remain.

Using with an Ethernet/Serial adaptor

The weeder interface in XTension supports a connection via an ethernet/serial adaptor such as those from Wiznet. The proper settings are baud: 9600, no parity, 8 data bits, 1 stop bit.

supported_hardware/weedtech.txt · Last modified: 2011/07/15 10:01 by James Sentman
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