The demand for contemporary touch-based management programs is rising shortly, pushed by their smooth design, ease of use, and lack of mechanical parts. This method introduces an AC touch-controlled solid-state relay (SSR) able to dealing with enter voltages from 100V to 250V AC. It’s designed to modify masses similar to bulbs, followers, and different family home equipment. At its core is the TTP223 contact sensor IC, which integrates an ADC converter and helps selectable contact modes by way of a solder jumper (J1). These modes will be configured by way of TOG (toggle) and AHLB (lively excessive/low at power-up) settings, providing flexibility in operation.
The switching is managed by a BT136S TRIAC, delivering dependable SSR efficiency with out transferring elements. By combining contact sensing and relay features, the system achieves a compact, sensible, and silent design inside a 4cm footprint. Two terminal inputs present simple connections—one to the AC energy line and the opposite to the equipment, making certain easy and environment friendly management.
Fig. 1 exhibits a compact, trendy AC solid-state relay (SSR) module with built-in contact controls. It options two capacitive touchpads (clearly marked with contact icons), pushed by the TTP223 IC, permitting linked home equipment to be toggled with a easy faucet. The massive black part is an optically remoted TRIAC-based SSR or relay, designed for switching high-voltage AC masses safely.
The BT136S TRIAC serves because the SSR, able to switching 100-250V AC masses (as much as 4A, ~880W), appropriate for bulbs, followers, and home equipment. The parts required to assemble this method are listed within the Invoice of Supplies desk.
| Invoice Of Supplies | ||||||
| Title | Desinator | Footprint | Amount | Manuf. Half | Manuf. | Suppl.half |
| C-0805 | C1 | CAPACITOR_0805 | 1 | |||
| 30pF | C2 | 201 | 1 | GJM0335C0J300JB01D | Murata Electronics |
81-GJM0335C0J300JB1D |
| 100nF | C3 | C1206 | 1 | CC1206KKX7RYBB104 | YAGEO | C106241 |
| Toggle Mode Jumper | J1 | JUMPER_SOLDERPAD_2-1 | 1 | |||
| LED | LED1 | LED_CHIP-LED0805 | 1 | |||
| 1kΩ | R1 | R0805 | 1 | 0805W8F1002T5E | UNI-ROYAL | C17414 |
| 220Ω | R2 | R0402 | 1 | RC0402FR-07220RL | YAGEO | C112291 |
| 100Ω | R3 | RES-SMD_L6.4-W3.2-R2512 | 1 | SR2512FK-7W100RL | YAGEO | C876841 |
| BT136S | U1 | TO-252-2_L6.6-W6.1-P4.57-LS9.9-BR-CW | 1 | BT136S-600D | GOODWORK | C18186224 |
| MOC3041SM_C22373366 | U2 | SMD-6_L8.8-W6.4-P2.54-LS9.4-BL | 1 | MOC3041SM | AOTE | C22373366 |
| LD05-23B05R2_C42432360 | U3 | PWRM-TH_LD05-23BXXR2 | 1 | LD05-23B05R2 | LZTEC | C42432360 |
| TTP223 TOUCH PAD | U4 | TOUCH_PAD | 2 | |||
| TTP223E-BA6 | U5 | SOT-23-6_L2.9-W1.6-P0.95-LS2.8-BR | 1 | TTP223E-BA6 | TONTEK | C129457 |
| 3pin_solder_pad | U6 | 3PIN_SOLDER_PAD | 1 | |||
| DB301V-3.5-2P-GN | U7, U8 | CONN-TH_DB301V-3.5-2P-GN | 2 | DB301V-3.5-2P-GN-S | DORABO | C695629 |
The system is split into two foremost circuits: the contact sensing circuit and the solid-state relay (SSR) with a snubber circuit. Each sections are built-in right into a closing mixed system.
Contact sensing circuit
A capacitive contact sensor is used for the contact system. This sensor operates successfully even behind plastic or glass enclosures by detecting modifications in capacitance, making it appropriate for smooth, sealed interfaces. The TTP223 IC permits number of varied contact behaviours as outlined within the datasheet. Fig. 3 exhibits IC TTP223 pinout particulars, and Fig. 4 presents the contact sensing circuit.
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