The required product is a wireless indoor climate sensor. It is an autonomous sensor that transmits several parameters concerning its environment wirelessly. The product will be used to demonstrate a number of energy efficient sensors. The electronic instrumentation department at Delft University of Technology developed these sensors in association with NXP. Since the desire to communicate information wirelessly in an energy efficient way existed, several options could be explored. First a wireless protocol had to be chosen. Thereafter, a hardware solution had to be found in order to implement the chosen protocol. Lastly, the information had to be displayed on a computer screen. This thesis investigates six wireless protocols that can transmit information. The investigated protocols are Bluetooth, ZigBee, Rubee, UWB, Z-Wave and the well known Wi-Fi. In order to choose the right option, several criteria were set up. First of all, the system had to be entirely wireless. Therefore, the power consumption had to be as low as possible. Moreover, the program of requirements stated that the transmission distance had to be at least five meters. After searching for suitable wireless protocols for this assignment, the hardware had to be chosen. The SX1212, XBEE series II, ATmega128RFA1 and CC430xxxx were found as potential solutions. The same criteria that were subjected to the wireless protocols were applied to these hardware solutions as well. Furthermore, the ease of hardware implementation was added as well as the ease of software implementation. Additionally, the knowledge available at EEMCS about these solutions was appended to the criteria. The measurements had to be displayed after setting up the wireless communication. The measurements could be displayed on a website, an app or a computer screen. The measurements could have been stored locally as well as externally. Safety is one of the criteria used to choose a display solution. This was why locally storing the measurements was preferred. However, the recent popularity for apps was a criterion for choosing the method of displaying the information as well. The ZigBee solution was chosen, because it was most suited for this project. Rubee, UWB and Wi-Fi were abandoned, because those protocols do not meet the specifications. ZigBee uses less power than Z-Wave and therefore, is chosen above Z-Wave. The fact that former researchers encountered problems while setting up a connection between two Z-Wave modules was added to the argumentation. Bluetooth can have either a short range or a high outputpower to transmit. Since the “short range” was considered too short, Bluetooth was abandoned as well. Moreover, ZigBee had been developed to transmit a low amount of data in a low power consuming way. Hardware had to be chosen after finding a suitable protocol. The XBEE series II was chosen from the hardware solutions. A low amount of data had to be sent and the XBEE series II was the least power consuming of these solutions while sending a low amount of data. Moreover, the XBEE series II was the easiest to implement. There were several options to display the received data. Since the data had to be received by a computer, displaying it on a computer screen was chosen. The data was displayed in the console in which the program was written. Moreover, an internet connection is not mandatory. However, it was chosen to develop an app as well. This is because an app can be viewed anywhere at any time. The current running through the system was measured in order to check if the requirements were met. The system appeared to have an average current consumption of 50.8?A. This consumption would be sufficient for the system to run autonomously for a year. Furthermore, it was necessary to check if the system was able to transmit over at least 5 meters, since the program of requirements stated this demand. The measurements showed that the system was able to transmit over 40 meters, which was enough.