So, just make sure you have node and node-gyp as well as the Broadcom library to build the project. 1  Download BCM2835 library and follow installation instructions. 2  In case, you don't have node-gyp, install it first: $ sudo npm install node-gyp -g. 3  Generate the configuration files. $ node-gyp configure.  Build the component. $ node-gyp build.
Cost to Install Cement Patio. While the cost of installing a cement patio can range from $5 to $11 per square foot, the average cost for the typical cement patio installation is generally closer to $8 per square foot.
According to PaveTech, the average concrete patio will cost around $700 using pavers and doing all of the work independently. When professional concrete contractors and excavators are used the costs will obviously climb substantially. Traditionally, a patio at the size mentioned will cost roughly $2,000 to $4,000. The resale value of this update would hold at the high-end of $3,200, or an 80% return on investment. The above figures place the patio installation at $21 per square foot.