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Low-Cost Smartphone-Controlled Exercise Machine for Arm and Leg Muscles
(2026-01-01)
Pimpol, Jirapun
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Channumsin, Orapin
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Pattoom, Pongwat
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Weawthaisong, Wipakpong
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Singusaha, Orathai
This work proposes the design of a smart exercise machine for arm and leg muscles. The designed muscle arm and leg exercise machine can be controlled wirelessly through a smartphone application, which features a 3-level speed adjustment function. The motor speeds for arm muscle exercises are defined as 180, 210, and 240 rpm, while the speeds for leg muscles are set as 240, 270, and 300 rpm, respectively. In addition, the proposed machine incorporates a time function for muscle exercise and it can control the spin direction to rotate either forward or backward, depending on the requirement, using a microcontroller. Furthermore, it can display the distance traveled by an application on a smartphone. The experimental operation of the automatic arm and leg exercise machine revealed that it could accomplish its intended functionality.
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Automated Elderly-Tracking Robot Prototype Using an AI-Based Vision Camera
(2026-01-01)
Pimpol, Jirapun
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Mongkolwai, Pratya
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Pukkalanun, Tattaya
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Tangsrirat, Worapong
This paper presents the design and implementation of an automated elderly-tracking robot prototype that integrates an AI-based HuskyLens vision sensor with ultrasonic sensors for target detection, tracking, and obstacle avoidance. Sensor data are processed by an Arduino UNO microcontroller, which controls TorqueNADO motors to achieve autonomous navigation and real-time motion control. The system also incorporates an ESP32-CAM module to provide live video streaming of the elderly user via the Blynk smartphone application, enabling remote monitoring over the Internet. In addition, the prototype supports a maximum payload of 3 kg for carrying essential lightweight items for elderly users. Experimental results demonstrate that the proposed robot meets the intended design objectives and validates the practical feasibility of the system.
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VDGA-Based Resistorless Dual-Mode SIMO Biquadratic Filter
(2024-01-01)
Pimpol, Jirapun
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Channumsin, Orapin
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Pukkalanun, Tattaya
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Tangsrirat, Worapong
This work introduces the synthesis of a resistorless single-input multiple-output dual-mode biquadratic filter. The proposed circuit can perform both voltage-mode and current-mode operations without making circuit modifications. It consists of two voltage differencing gain amplifiers (VDGAs) as an active element, together with only two grounded capacitors as passive elements. Furthermore, it has the capability to produce the conventional biquad filter functions - namely, simultaneous highpass, bandpass, and lowpass responses - in either voltage or current mode. The proposed dual-mode biquad filter can electronically adjust significant filter parameters. TSMC 0.25-μ m CMOS process parameters are utilized in computer simulation to validate the theoretical expectations.
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Resistorless Phase Shifter Realization with a Single VDGA
(2022-01-01)
Pimpol, Jirapun
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Channumsin, Orapin
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Tangsrirat, Worapong
This paper discusses an electrically adjustable phase shifter that uses only one voltage differencing gain amplifier (VDGA) and one floating capacitor. This circuit does not desire any external resistors, which results in a least number of active and passive components. The proposed phase shifter circuit provides first-order allpass filter responses, with the external DC currents used to electronically modify the passband gain, pole frequency, and phase response. The simulation results of the proposed phase shifter circuit insist the theoretical evidence's applicability.
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Automatic Monitoring and Controlling System for Hydroponics Greenhouse Environments Through Smartphone Application
(2022-01-01)
Channumsin, Orapin
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Trancharoen, Jirasin
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Sonchaiyaphum, Sarut
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Pimpol, Jirapun
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Tangsrirat, Worapong
This article proposes the design and construction of environmental control systems for hydroponics grown vegetables that enable automated control over the environment inside the greenhouse to be most suitable for the plants growth by using microcontroller processing. The systems can track various measurements such as temperature, humidity, intensity of light, water pH value, and water level in a greenhouse by using Blynk application on a smartphone as well as LCD display screen surrounding the greenhouse area. In addition, the systems can automatically control the operation of ventilation fans and mist sprayer machine according to the specified humidity temperature value and it can be set ON and OFF timer for whirlpool pump and LED light bulbs. Moreover, after a 42-day-Testing period of planting three varieties of lettuce, which are Red Oak, Green Oak, and Frillice Iceberg Lettuces, it has been found that Red Oak lettuces have an average width of 21.2 cm, a length of 26.4 cm with a weight of 120 gram, while Green Oak lettuces have an average width of 8.1 cm., a length of 31.0 cm with a weight of 120 gram and lastly, Frillice Iceberg Lettuce has an average width of 19.0 cm, a length of 46.9 cm and a weight of 200 gram.
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Floating Series RC Impedance Simulator Using Single FB-VDBA
(2020-03-01)
Pimpol, Jirapun
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Channumsin, Orapin
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Tangsrirat, Worapong
This article introduces a floating series RC impedance simulator circuit employing a single fully-balanced voltage differencing buffered amplifier (FB-VDBA), as an active element. The presented simulation includes only one FB-VDBA, a single resistor, and a single capacitor. The simulated equivalent series resistance and capacitance values are alterable via the DC biasing current of the FB-VDBA. As a demonstrative application, the presented floating series RC impedance is applied to configuration a 2<sup>nd</sup> order high-pass filter. To evaluate the correctness operation of the presented circuit and its application, the simulation results based upon TSMC 0.25-μm CMOS technology are also contained.
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Low-output-impedance electronically adjustable universal filter using voltage differencing buffered amplifiers
(2019-03-16)
Pimpol, Jirapun
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Roongmuanpha, Natchanai
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Tangsrirat, Worapong
In this study, a voltage-mode universal filter with three inputs and single output is presented. The circuit is resistor-less, and consists of only two VDBAs and two capacitors. The proposed TISO filter realizes all the five standard biquadratic filter functions at the low-impedance-output terminal without any component matching criterion. The effect of the VDBA non-idealities on the presented filter performance is also discussed in detail. To prove the theoretical finding, simulation results are provided using PSPICE software.
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Electronically adjustable capacitance multiplier circuit with a single Voltage Differencing Gain Amplifier (VDGA)
(2019-01-01)
Tangsrirat, Worapong
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Channumsin, Orapin
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Pimpol, Jirapun
In this work, we propose a resistorless realization of a simple electronically adjustable capacitance multiplier circuit using a single voltage differencing gain amplifier (VDGA) as an active building block. The circuit utilizes one VDGA and only one capacitor in a simple circuit configuration. The proposed capacitance multiplier circuit can be tuned electronically with the adjustment of the transconductance gains of the VDGA. To emphasis the applicability of the proposed circuit, a second-order RC low-pass filter is constructed as an application example. PSPICE simulations are performed to verify the theory.
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MISO Universal filter employing single VDTA
(2018-08-13)
Pimpol, Jirapun
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Channumsin, Orapin
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Tangsrirat, Worapong
This work explains a voltage-mode universal filter with multiple input and single output terminals (MISO) using a single voltage differencing transconductance amplifier (VDTA), two capacitors, and one resistor. The proposed circuit offers simultaneous realization of all the five standard filtering functions; lowpass, highpass, bandpass, bandstop and allpass, without modifying the circuit configuration. Besides, the filter configuration provides an electronic adjustment of the natural angular frequency ±o and the quality factor (Q), and also exhibits low active and passive sensitivities. The proposed circuit performance diagnoses with PSPICE program, and confirm the theoretical predictions.
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Vdiba-based floating lossless inductance simulator employing a single grounded capacitor
(2016-09-01)
Pimpol, Jirapun
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Channumsin, Orapin
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Thongsopa, Chanchai
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Tangsrirat, Worapong
This paper presents an actively floating lossless inductance simulator based on employing voltage differencing inverting buffered amplifiers (VDIBAs) as new active components. The proposed synthetic inductor employs only two VDIBAs and one grounded capacitor, which is resistorless structure and suitable for integrated circuit design. The realized equivalent inductance is electronically adjustable through the transconductance parameter of the VDIBA. An application example of the proposed tunable floating lossless inductor on the realization of the second-order RLC bandpass filter has been designed and simulated. PSPICE simulation results with standard 0.35 μm BiCMOS process model are also included to demonstrate the utility as well as the workability of the proposed simulator.

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