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.
Typical costs for the preparation and laying work such as digging out the required area, laying the base and compacting it before laying the patio slabs in sand and pointing between them could cost around Â£30-Â£40 per square metre for labour and materials (not including the patio slabs).lthough they may look durable, if the patio is going to see a lot of use it may be better to stick with a thicker slab. Mid-range patio slabs cost between Â£20 and Â£26 per square metre while top of the range exotic flagstones can cost around Â£32 per square metre.