This Parallax TSL1401 Linescan Imaging Daughterboard plugs into the 2×6 connector found on the MoBoStamp-pe, the Propeller Backpack, the Spinneret Web Server, and the DB-Expander. It provides one-dimensional sight to just about any microcontroller.
- Detection of objects, edges, gaps, holes, liquid levels, etc.
- Non-contact measurement of height, width, diameter, position
- Line following for robots
- Light and flame detection and location for robots
- Simple barcode reading
The TSL1401-DB includes the TAOS TSL1401R 128-pixel sensor chip, a 7.9mm focal length imaging lens, and control electronics to aid in capturing images for evaluation. It produces a clocked analog data output whose voltage levels correspond to the light intensity at each pixel. By means of an analog-to-digital converter (or even a simple digital logic threshold), image data are transferred to a microcontroller easily to detect objects, edges, gaps, holes, liquid levels, textures, emissive sources, simple barcodes, and other visible features. By combining it with the MoBoStamp-pe and a suitable output device, you can construct a complete inspection system in a very compact form factor.
Central to the TSL1401-DB's ease of use is the 50-page manual (downloadable below). The AVR coprocessor firmware for the BS2pe Motherboard (MoBoStamp-pe), for example, provides a completely scriptable imaging front end that captures images in the background and locates features while the BASIC Stamp is busy with other tasks. Also included is a programming template and examples for both the Motherboard and the BASIC Stamp 2.
As an aid to seeing what the camera sees in real time, both for setting up and alignment and for trying various detection strategies, a PC-hosted monitor program provides both an oscilloscope view of the pixels, as well as a sweeping view of multiple scans laid side-by-side. It also includes user-selectable measurement tools for locating edges, counting pixels, computing extrema and averages, etc. This program is designed to be used with the MoBoStamp-pe and automatically uploads the PBASIC code necessary for communication.
Linescan Imaging Daughterboard Features
- 128-pixel linear image sensor (TAOS TSL1401R)
- Focusable imaging lens
- Simple three-pin interface with analog pixel output
- 12-pin Hirose DF11 (M) main connector
- 6-pin Hirose DF11 (F) accessory connector
- Pixel clock input signal (CLK): CMOS
- Start scan input signal (SI): CMOS
- Analog output signal (AO): 0V to Vdd
- Optional trigger input signal: CMOS
- Optional signals through accesory connector (CMOS): SCL input, SDA I/O, Strobe input, Strobe output (open-drain)
- Lens: 7.9mm focal length, f2.4 fixed aperture, manual focus (min. 25mm), 12mm × 0.5mm thread, FOV 53°
- Exposure Time: 267µS to 68mS (MoBoStamp-pe, Propeller, SX, PIC, AVR, etc.); 2.03ms to 68ms (BS2)
- Resolution: 128 pixels (grayscale); 255 pixels (interpolated binary)
- Power Requirements: 3.3V to 5.0V at less than 5mA
- Dimensions (with lens): 1.35 × 1.35 × 1.22 inches (34.3 × 34.3 × 31mm)
Linescan Imaging Daughterboard Resources