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Hand-Held Wireless Remote Control Thermostat System L. D. Allen and M. Tahernezhadi Department of EE Northern Illinois University DeKalb, IL 60115 ABSTRACT

This paper provides the design of a hand-held wireless remote controlled thermostat system for the control of a residential Heating and Air-Conditioning (HVAC). Any person who can operate a telephone will be able to use the hand-held controller, which, for prototype purposes, will be fashioned from a telephone handset with push-button and sliding switch controls. With this remote control, a disabled person will be able to have complete HVAC control at their fingertips. The device will display ACTUAL TEMPERATURE with a green, 2-digit, 7-segment LED and SET TEMPERATURE with a red, 2-digit, 7-segment LED. The actual temperature and the setting temperature have a range from 00 to 99 °C.

I. INTRODUCTION

People with limited mobility require the same controls over their home’s environment as people who have normal mobility. If the temperature setting in a person’s home is too hot or too cold for comfort, the home’s HVAC (heating/air conditioning system) control can be set to make the temperature more comfortable. For a person with normal mobility, this poses no particular problem as one can simply go to the HVAC control module and adjust the thermostat’s temperature setting accordingly. However, for a person with a mobility issue, physically getting to the control module to adjust the setting could be difficult or impossible. Moreover, the wireless design project can be configured to turn on and off other household appliances, enabling individuals with limited mobility to remotely control multiple number of household appliances. The availability of the portable unit also provides the caretaker with a higher degree of effectiveness and flexibility, which in turn leads to a reduced healthcare cost for the patient.

II. Design DISCRIPTION

The device displays ACTUAL TEMPERATURE with a green, 2-digit, 7-segment LED and SET TEMPERATURE with a red, 2-digit, 7-segment LED. The actual temperature and the setting temperature have a range from 00 to 99 °C.

The device interfaces locally with the user via 3 push-button switches and 2 4-position slider switches with the following functions:

Push-button 1 - Device Circuit/Microcontroller Reset Push-button 2 - Increment Temperature Setting Push-button 3 - Decrement Temperature Setting

Slider-switch 1 - Function Selector Switch (Heater/OFF/FanON/Cooler) Slider-switch 2 - Remote/Local ON/OFF Switch (RemoteON/OFF/OFF/LocalON)

* With LocalON control selected, all local switches are functional. Device status and switch settings are displayed via 6 LEDs and the aforementioned 7-segment LED displays. LocalON are clear green , RemoteON is clear red, Heater is red when the Heater is ON, OFF/Standby is amber, FanON is green, and Cooler is white green when the Cooler is ON.

* The device determines actual temperature via interface with a DS1620 Digital Thermometer and Thermostat integrated circuit mounted on the exterior of the TCM casing. With Heater selected, the TCM will turn on the

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Tahernezhadi, M., & Allen, L. D. (2001, June), Hand Held Wireless Remote Control Thermostat System Paper presented at 2001 Annual Conference, Albuquerque, New Mexico. 10.18260/1-2--9320