Mono, an open source implementation

The .NET framework for use on Linux, Unix and Windows System, has gone beta!

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Imote2 with Camera setup IMB400 over Ubuntu 9.10/10.04

Imote2 Camera driver for TinyOS is available in contribution directory of  TinyOS 2.x . It goes by the name of  tinyos-2.x-contrib . Its location within is  tinyos-2.x-contrib/intelmote2/apps I am assuming that you have tinyos-2.1.1 installed, this is required to have Camera Driver build. If you dont have it installed... than better have it done by invoking: apt-get install tinyos-2.1.1 From here on to get the driver working,  the procedure is as follows: Browse to opt directory. cd /opt The recommended way to get the source of tinyos-2.x and tinyos-2.x-contribis is through CVS. echo "Getting TinyOS 2.x and TinyOS 2.x-contrib from CVS" echo "Press enter when asked for password." cvs -d:pserver:anonymous@tinyos.cvs.sourceforge.net:/cvsroot/tinyos login cvs -z3 -d:pserver:anonymous@tinyos.cvs.sourceforge.net:/cvsroot/tinyos co -P tinyos-2.x cvs -z3 -d:pserver:anonymous@tinyos.cvs.sourceforge.net:/cvsroot/tinyos co -P tinyos-2.x-contrib --OR--  e...
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Tensorflow - Simplest Gradient Descent using GradientDescentOptimizer

Below is the code to find the minimum possible value of weight (w) such that the outcome of equation is closest to 0, using Gradient Descent method. These weights are multiplied with input (x) to compute cost, thus minimizing it. The equation is below... w 2 - 10 w + 25 ---------------------- (i) i.e. ( w - 5 ) 2 Thus, the coefficients from (i) would be 1, -10 and 25 import numpy as np import tensorflow as tf coefficients = np.array([[ 1 ], [ - 10 ], [ 25 ]]) # try 1, -20, 100 -- line 4 w = tf.Variable([ 0 ], dtype = tf.float32) x = tf.placeholder(tf.float32, [ 3 , 1 ]) cost = (x[ 0 ][ 0 ] * w ** 2 ) + (x[ 1 ][ 0 ] * w) + x[ 2 ][ 0 ] # (w-5)^2 train = tf.train.GradientDescentOptimizer( 0.01 ).minimize(cost) init = tf.global_variables_initializer() with tf.Session() as session: session.run(init) print (session.run(w)) for i in range ( 1000 ): session.run(train, feed_dict = {x:coefficients}) print (session.run(w)) T...
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Imote2 IMB400 pull-up resistor fix

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I successfully fixed the hardware issue which was causing the interrupt to loose over I2C bus. Below is the method for it. IMB400 looks something like : 1.8KOhm resistor is required, its very cheap and easily available. I bought it from SimLim tower here in Singapore, 4 for just 20 cents. Its 1/4W 5% tolerance . The IMB400 sensor board, containing Camera, Microphone and Speaker required a pull-up resistor attached between VCC and R8 to work with Linux 2.6.29b image . The need of the resistor is mentioned as Currently this driver requires a pull up resistor on the data line of the gpio based i2c bus. I have a 1K8 resistor between vcc at the side of the board and the right pad of r8. Without this only this nothing can currently be read back from the chip. There are set of commands to run the sample application making use of the camera driver OV7470. After careful soldering the back of IMB400 scanned back image looks like below: The file system image, blob, and kernel images a...
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