# A Simple Foot Plantar Pressure Measurement Platform System Using Force-Sensing Resistors
## 1 Introduction  
Many people spend part of their time standing, but not many doctors in Indonesia know the biometric problems faced by them can be predicted from the load distribution on the foot. The amount of load on the foot depends on body weight (BW) and gender. The results of the previous study showed that while standing bare foot, the heel and arch areas bore a burden of about 70% BW, while themetatarsal area and toe toes bore 30% BW [1]. The results of the study also proved the burden on the soles of women's feet is larger than men [2].  
Load distribution in the foot can also show the stability of the body when standing, which is from counting trips of the Center of Pressure (COP) speed swaying at mediolateral and anteroposterior directions measured using force plate [3]. When people walk, the stability and risk of fall can be identified from the COP trajectory. The identification is obvious for example, when COP trajectory in the arch area of one leg is on the lateral side of the arch (high arch) while the other leg is normal. In addition, the measurement of the load on the sole of the foot when standing can also show the comparison of load between legs which can be known from the calculation of the asymmetry index (ASI). The type of foot (high arch, normal, or flat foot) can also be predicted from the load ratio in the arch area to the load across the soles of the foot without the radius [4], the most accurate way to know the type of foot is to scan the foot (footprint scanning) using [PERSON]'s method [5].  
Measurement of load distribution on the foot was also used in several countries to evaluate the development of the treatment of diabetics, there are injuries in the foot ulcer, nerve death (neuropathy), or before and post-foot amputation [6]. Interpretation of the load distribution data of diabetics is not easy, requires the history of the disease and the treatment that has been done as well as changes in the measurement result of load distribution at any time. In comparison with people with arthritis and joints pain (osteoarthritis), interpretation of its burden distribution data is easier, because it is obvious from the difference of load distribution between the soles of the left and right feet and static posture that is not upright because they feel pain compared with healthy people (normal foot) [7].  
The results of the load distribution measurements on the foot are also used as a base for designing orthotic shoe soles for pain sufferers in the heel area due to the inferior calcaneus spur, where the burden in the area should be equal to or smaller than the minimum pain pressure gained from the measurement using Algometer [8].  
The foot gauge pressure measuring platform is a tool for measuring the load of static contacts between foot and base. This measuring instrument is an electronic device with a piezoelectric transducer which will produce voltage change [9] or force the sensing resistor (FSR) sensor [10] which will produce resistance change when receiving pressure. This paper aims to develop a low-cost static load measuring device using FSR sensors. This is because similar products with thousands of FSR sensors are expensive, up to US $20,000 [11], so it is a burden for hospitals and biomechanical research centers in Indonesia to use this kind of measurement.